Er, I thought 7 was the best so far... And I'm a Mac guy.
I agree, though I haven't upgraded my home (DAW) machine to it as Vista works fine.
I'm way more afraid that eventually I'll have to go to Windows 8, which looks horrific to me. I hope there's some way to disable that silly UI. Every time I see it in a commercial I think, "Yup, that looks slick on a commercial, but I bet it sucks to use in real life."
Here's the cold truth though. Regardless if you're a Windows or OSX user, the OS isn't designed for us. It's made for basic office workers and people who surf the web. Apple is a bit better because they focus on things like their iMovie, Logic and Garageband, but even they are starting to suck really hard these days with doing things like burying files in "Library" files. My wife's old iBook had a hard drive failure and I was all, "Oh no prob, we've got a Time Machine back up!" I was pissed to find iPhoto had taken all of her photos and put them in some monolithic library file... which was somehow corrupted in the back up. Lucky for me I know how to dig into those things and get files out of them, but wtf? Does Apple think basic files in a folder are too much for people?
So, I think that no matter what OS you use these days you'll have to spend time customizing the settings to make it work reasonably well for DAW and other types of "Pro" media use.