Hi Vincent,
Good luck with your decision. It appears to me that the most of the bashing comments in this thread comes from users experienced mostly if not ONLY with one of the platforms.
I have been with MS since the MS-DOS / 80286 days and also spent enough time with OS/2 and Linux. I never truly tried Apple until the beta release of Boot Camp.
At that time I needed to replace my Dell laptop and the MacBook Pro / Boot Camp combination seemed a perfect solution to my dependency on the MS platform at the time.
My only regret is that I did not do it sooner. It took only few months and I was booting into OS X most of the time. I don't know if I would appreciate OS X as much without my MS experience.
In my MS days I build many PC for friends and many of them never used computers before. Now I know that they would have been much better off if I set them up with Macs.
As far as converting from Windows to OS X, my biggest problem for me was trying to do things the Windows' way. I think that starting with OS X would have been easier if I did not use Windows for all those years before.
Statistically I am sure it is not true, but I feel that most of my time in Windows environment is spent on troubleshooting and maintenance.
I know for sure that besides doing backups, most of my time in OS X is spent on what I need/want to do.
Best of luck.