Diehard MS user here. Loved XP Pro, and now I'm using Windows 7. So far, so good. Working in media & graphic design, there's been nothing I can't do that my brother in law with his Apple. Course, he gets to pay a lot more for repairs. Plus, it's nice knowing I can write my own applications and not have to bow before the Apple gods to deem them relevant.
I think my tagline says it best.
Politics, religion, and operating systems are all the same subject.