It's interesting: all the things for which Windows gets criticised in this post are things which I have never have a problem with in the Windows environment. I spent 10 years in Windows, starting in 1997 (after abandoning, I think, System 7.5.5). I used to own an LC II, a IIci and a PB160. I gave it all up because Apple was just not in a good place at the time and the world was moving toward Windows fast. Not once in the past ten years did I get a virus or a nasty worm. Lots of nasty cookies, yes, but nothing serious. Crashes, especially with XP Pro, were rare. And I mean rare. I've been back in the Mac environment for 2 months now with a MB C2D and I've had at least a dozen application crashes in that time. And not just the smaller shareware programs that you might expect to throw a hissy fit every now and then (and we can all, I'm sure, live with those), but iPhoto and Office 2004 (yes I know the former is Microsoft).
To put it bluntly, I've had more crashes with this Macbook than I ever had with my IBM Thinkpad X40 running XP Pro. There is a good chance, I'll admit, that I'm not doing something right (like repairing permissions, which I do after every application install), but time will tell as I learn more.
Bottom line is this: Windows XP Pro was no less stable, productive or intuitive than OS X, at least for me. And in several areas, the Mac environment is actually lacking. Desktop search is one. IMHO, Spotlight is perhaps the most pathetic excuse for a search tool (at least for documents) I've come across, especially compared to the various freeware options available for Windows. And Mail and iCal are downright embarrassing compared to Outlook 2003 (even Outlook 2000), again in my opinion (and I'm a so-called 'power' user who manages lots of email, contacts and appointments).
My Thinkpad X40 used to (and still) gets just as many looks as my MB, and that Thinkpad is almost three years old. It traveled around the world with me five times, plus numerous other business trips, and never missed a beat. When the hard drive started to make funny noises one day, IBM sent me a new drive overnight (and I live quite a distance from a major metro centre). It was quieter, smaller, lighter and thinner than the MB, and probably about 80% as fast for common Office applications and OS tools (except startup - god Windows is slow...).
So why did I switch (and to get back on topic)? There is an elegance about the Mac environment that you just don't find in Windows. It's definitely user-friendly, but also allows you to 'tinker' if need be. Installation of applications is 100% cleaner (er, what's a registry?) and managing OS X overall is heaps easier than XP Pro. I switched because I wanted to see what all the fuss was about. I'm definitely glad I did, but I certainly do not feel like I any more productive, enamoured or secure.
I was all three under Windows, and now my computer just makes a different startup sound.