Don't bother with hot corners. Keyboard shortcuts. They are a lot faster than using a mouse. WinKey brings up StartScreen/Search, WinKey+C the Charms thing.
Linux, probably depends. I use openSUSE, I don't think its any worse or better than Windows.
OS X, worse than Windows apparently. Mountain Lion apparently fixes things with full screen mode greying out other monitors.
Multi-monitor setups are generally ignored since people generally don't use them.
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