Windows ran me off with Vista. I switched to a Mac in 2007. I do continue to maintain a Win7 gaming machine (DIY build) because Windows is still easily the best choice for gaming. However, for everything other than gaming, I don't miss the frustrations and headaches related to Windows. I recently moved my wife over to a Mac and my time spent doing home IT support has dropped to virtually nil.
My employer gives everyone the choice between Windows and Mac... out of ~50 people in this office, I believe only 2 are using a Win machine (both Thinkpads).