I think some people might be missing the point of the comparison here.
When we're talking about bloatware here, it's not so much about things that just take up hard drive space, etc.
On the PC side, something like the MS Office trial isn't necessarily so annoying.
What people are talking about here are all the other annoying programs and services that are installed on top of the standard Windows install; trial programs, little custom services, stuff like the WildTangent game stuff on HP's, etc.
This stuff IS annoying and does negatively affect the Windows experience. All you have to do is look through forums to see tons of people asking how to remove all this crap, how to do a clean install, etc.
That's another big area here; with a number of PC's, you CAN'T easily do a clean install of just Windows by itself. With Sony, for example, you can only make recovery disks that recover the original Windows installation plus all the extra crap. They make it pretty hard to do a real clean Windows install (it's possible, but requires getting a bunch of drivers yourself and doing a clean Windows install with another Windows disk, not the one Sony makes available).
At least on the Mac side, if you buy a new Mac, you can easily use the included CD to do a completely fresh install and uncheck any elements you don't want (Office trial version, iWork trial, iLife, etc.).
On the PC, these often aren't just things that take up space on the hard drive; they're also programs that start up in the background when you boot up, dramatically adding to the startup times (I was just in a Circuit City yesterday and overheard a customer asking why the HP laptop they were looking at was taking so long to boot to the desktop and actually become useable).
The Circuit City guy told this customer about how they offer one of their special "Firedog" services just for the sole purpose of removing all the crapware, etc.
Some companies are better about this than others; but the vast majority of PC's being sold today, especially the consumer models, are loaded with this crap.
Microsoft themselves refer to these programs as "craplets" and don't like them either, because people associate the bad user experience with Windows itself, and don't realize it is the extra junk.
This isn't about things like the MS Office trials on PC's, or bundled stuff like MS Works which are not specifically annoying, and also can be easily removed. It's not even about something like the 30-day trial of Norton Antivirus, which at least on the PC serves a useful purpose.
It's about all the other irritating trialware and crapware that is loaded on there.
-Zadillo