I'm sure I could get used to win8 quite quickly. I'll probably install it next time I upgrade my windows PC. But admit it - you had no idea how to shut down your computer in win8 until someone told you.
Whole app store thing helps a great deal. You install apps way faster and easier then ever before, like it is on a mac.
I would compare it when Apple changed scrolling, it took some time to get used to it (or flip the setting).