What? You mean it's only available on Linux? (That's the only PC OS I can think of that seems to have been developed as a hobby.) ;-)
On a more serious note, I don't think the OS hosting a professional tool is much of an issue as long as the developers know how to use the OS to support their tool. If money is no object, you can alway get a new computer with the OS required and use your other computers to handle your Non-PCB stuff.
If you're going to do any large projects, you will probably want two monitors---one for the schematic and one for the PCB layout. That greatly reduces the window swapping as you revise pin connections etc.
Mark Borgerson