Well, if you're honestly wanting to hear what made someone switch or what made them like their Mac after they did, I've got a fair bit I can share - I hope you don't mind a (really) long post...
I had been curious about Macs for years, but I was forced to switch when my desktop died, leaving me with the 12" dual-USB 600MHz iBook I'd gotten for free a few months prior and hadn't really touched since.
After a first hesitant week, wherein I discovered that many, many updates needed to be applied, and that IE 5 was not the only browser, I came to really love that little machine, and OS X (Jaguar, since I couldn't justify spending the money on Tiger yet).
I think the best way to convey what I liked and what made me truly switch is to just give you a list of some features and experiences that made my day.
My very first experience with the iBook was positive. I remember spending an hour or more getting my older Win 2000 laptop's D-Link wireless card configured properly to connect to my router. I don't remember all the details about what was wrong, but it required calls to customer support, which folks told me that wireless security was just too much trouble, seldom worked right, and not to bother with it (ie, "we haven't got a clue what's wrong or what to do about it"). Clearly, that wasn't an option. I finally got it to work, but every few weeks something would happen and the laptop wouldn't connect, and I'd have to go through much of that hassle again.
I didn't have high hopes for the Mac, since Macs are off in their own little world, right? I mean, if the gold-standard Windows had such trouble, what are the chances it can even be done at all on a Mac? Well, here's how that scenario played out:
I booted up the iBook for the first time, noticed a Wifi logo up in that weird bar at the top, clicked it, noticed that there was a "Join other network" in the drop down, clicked that, typed the SSID and WEP password, and I was online in under 5 minutes. This on a completely unfamiliar machine that I was using for the very first time. My mind was slightly blown.
Next, stability. I know Windows 7 in particular is considered to be no slouch in that department, but my experiences were using Windows 95, 98, Me, 2000, and XP, and having record uptimes of maybe a week, with the machine very slow and buggy by that time. I went for around 6 months without rebooting the iBook, and used it hard during that time, too.
I added, tried, and deleted dozens of applications. I hooked up several external drives, moved over about 20GB of music and pictures. I kept dozens of tabs open in Firefox, crashed the browser many times, expected the OS to go down with it, but it kept humming along. I wrote, rewrote, compiled and tested old code from my CS days. I put it to sleep 4 or 5 times a day, every day. I played with every setting imaginable. It never slowed down; it never crashed. It would have kept running longer had I known that it could stay asleep for almost a week on batteries, but alas I shut it down when a terrible thunderstorm rolled through.
Speaking of sleep, the iBook was the first machine I ever used that reliably slept. My Win 98 desktop would sleep sometimes, but it usually wouldn't wake back up, and generally just BSOD'd if you pressed the sleep button on the keyboard. Same deal with my Win 2000 desktop. I later had an XP laptop and desktop, and same with them - sleep either didn't happen, the machine failed to wake up, or trying to sleep it froze the machine or threw a BSOD.
I slept the iBook all the time - probably 4 or 5 times a day, and never had it crash or behave abnormally afterward. It was great.
I also came to really love that installing applications usually meant just dragging the app from a disk image into my Applications folder. Only a few apps used an install wizard (Office, for example). And deleting meant dragging the app to the trash, like any other file. And yes, I know and knew back then that plists and other such files are left behind, but I also know and learned back then that they generally don't matter. Which is a nice contrast to my experiences with bad Windows installers that would throw crap all over the system, bad uninstallers that would leave it behind, frequently resulting in left-over processes still running, and PITA fidgeting with the registry to finally sort it all out.
How about plug-and-play? Surely this is sorted by now, but booting my old Intel D850GB desktop with a particular USB mouse connected resulted in a fatal error in Windows 2000 on boot. Also, I found that plugging in a simple Logitech USB 2-button mouse with a scroll wheel, even though the latest version of Control Center (or whatever it was called back then), would generally cause some unusual, but slightly comical, results.
I had 2 identical USB 2-button mice, and one multi-button Logitech (I forget the models now). The multi-button one is the one that caused the fatal error, so I would generally plug in one of the others, boot up, then try to swap in the multi-button. Keep in mind, Windows 2000 had seen this mouse dozens of times, but it would frequently mis-identify it as a "human interface device" and seemed to have no idea what to do with it. Frequently, it would think it was a certain model of trackball. A few times, it thought it was a USB mass storage device or my iPod.
So I would unplug the nice mouse and plug back in one of the cheapies, and sometimes the machine would BSOD. Sometimes it would fail to recognize the mouse in any way. Sometimes, it would misidentify it. But even if it realized it was the same damned mouse it had booted with, the scroll wheel would no longer work. The funniest part, if I swapped it out for the other, identical cheapie, it would usually be just fine.
I had similar, though less frequent, problems with an XP laptop (this is in late 2006, btw) mis-identifying another USB mouse in much the same fashion. The worst was when it thought my USB stick with some pretty essential work files was an HID and would simply NOT let me access the files. Since they were for Houghton-Mifflin's Windows-only problem-editing suite (I wrote problems for those CDs that used to come with math books back then), the iBook couldn't help me, but let me tell you, never once did that Mac or any other I've used misidentify anything I plugged into a USB port.
Despite all of these examples, my favorite part of using a Mac, and the thing that really cemented me as a switcher, is a more intangible quality that is tougher to describe.
Using a Mac feels different, beyond the superficial differences in appearance or actual function. I used to micromanage every detail of my Windows boxes. I had 20GB of music, all arranged neatly into carefully-labeled folders, with each file named according to certain rules I set up. I spent hours maintaining this system. I had a routine for system maintenance, including defragging, running AV scans, archiving old emails I wanted to keep, etc. I spent a lot of time reading, trying to to anticipate and preemptively deal with problems that still seemed to occur anyway, or trying to fix ones that already had. After my lone rescue floppy turned out to not work when I needed it, I started making a two new ones every month, and testing them every week or so just to make sure they still worked. That's a lot of time spent not getting the work done that I own the machine to do.
When I used the Mac at first, I tried to bring those old habits over, and it didn't go so well. Then one day, after a few months, I just...let go? I guess that's the only way to describe it.
I stopped micromanaging, because it didn't need to be done. I didn't have to defrag, cron jobs handled the maintenance overnight, and the machine was reliable enough that I could leave it on all the time for the jobs to run. iTunes was much better, and I could find what I wanted to listen to faster in it than I had been able to even with my tediously-maintained system with which I had, through hours of work, built an intimate familiarity. My external worked reliably enough that I had a backup system I could have faith in, without rescue floppies, or the dozens of CDs I burned just in case Windows didn't recognize my external drives, or corrupted one thinking it was a mouse. (Along these lines, I could tell you a few horror stories about a Windows Me Athlon system I briefly had that confused internal drives - it routinely reported my CD drive as another hard drive or Zip drive, among other, much worse such confusions that resulted in quite a bit of data loss.)
I found time and time again that, even when I was expecting trouble, there was no trouble. Image Capture handled my camera better than the Canon software had under Windows 2000 and XP. I got an old printer to work over the print server built into the router with just a little effort (seriously, about 15 minutes searching for a solution, and another 15 getting it running) with lp and an open-source driver. It had refused to work at all with XP, even with D-Link's print server driver and the usual HP printer drivers.
There were so many times when I'd think, hmm, I wish I could do this or that, only to find out that I COULD in fact do this or that, and in a way that was kind of how I thought it SHOULD be done just on principle. Settings were easy to find, and generally where I expected them to be. I loved that practically any text anywhere at all could be highlighted and copied. I loved that plugging in my iPod launched iTunes UNDER whatever I was doing (which, sadly, isn't the case anymore). I loved that I was able to just kind of forget the computer and get my work done, which actually just made me realize the computer even more, but in a good way, because it was working well.
In Windows, if I wanted to do something, I would generally start out by searching the internet, since I expected either to need new software, or to tweak a setting I wouldn't expect or know where to find. At first, I approached the Mac the same way. But over a short time, when I asked myself, I wonder if I can do this, I would start by just trying to do it in a way that seemed to make sense to me, and it very often worked just like that!
After a few years, I upgraded to Tiger, and things got even better. I could easily go on about how my iBook ran even faster than it had, how awesome the Tiger-version of Exposé was, etc, etc, but I won't. Likely no one will read all this anyway.
So instead I'll just give you one of the ever-popular car analogies to sum it up.
My old car was a decent car (at first anyway), and I knew it inside and out. I knew to turn the air conditioner off when going up a hill to keep the cruise from jerking into a lower gear. I knew how to manipulate the automatic transmission to get it to downshift if I wanted a little more oomph. The ride was a little rough, so I came to know where all the bumps were in the roads I drove most frequently so I could avoid them, and I automatically tensed up and braced for any unexpected bumps when I'd travel. I never thought of these quirks as problems, they were just there, and I dealt with them.
But then one day I got a new car, and to it I brought these old habits. At first, the new car didn't seem any better than my old one. Sure, it was newer and shinier, but it's just a car, it gets me from point A to point B. But soon I realized I didn't have to turn off the air when going uphill, or worry about goosing the pedal just right to get a downshift, and best of all, I realized I could relax when I traveled and not worry about the bumps in the road.
The first thing we had to do was set them up in the big dome... Tons of people around to help. Except, on the Mac side there was one person to help and 3 tables, while on the IBM side, there were 2 helpers per table (like 30 tables!). 
