I don't own a Win8 machine, so every encounter with 8 so far, I've had to deal with the gawd awful Metro interface. Metro is nothing like the WIMP UI. I can't get squat done in Metro. Once I get into the desktop, that's when I can get some stuff done. For serious work though, I always go command line. Gets the equivalent of dozens of mouse clicks worth with only a few keystrokes.
My beef is with Metro. Once on the desktop, I find 8 slightly faster than 7. still, I'll stick with 7 until MS banish Metro to the rubbish bin where it belongs. Honestly, computers are getting faster and faster, yet the GUI is make US do more work instead of the computer. With the CLI the computer does nearly all the work. The great thing about OS X and Linux is easy access to the terminal.