Most creative pro apps are only available on Windows or OSX. I don't hate Windows7 but I find OSX superior (integration, stability, decent shell etc). If you want OSX, you generally need a Mac.
I'd switch to Linux if the apps were there, but it's not even close. And I'm an edge case, I suspect most creative types would rather not mess with xorg.conf.
That's why I wish, over and over, for a Wine equivalent that runs OSX apps.
I have ran some windows audio applications on Ubuntu 10.04 and the timing accuracy (tested by specialist software) was several orders of magnitude higher. In addition, I can achieve higher workloads. This is all with software that wasn't even compiled for my OS.
I'd switch to Linux if the apps were there, but it's not even close. And I'm an edge case, I suspect most creative types would rather not mess with xorg.conf.