said Has anyone used Windows 8 yet?
Yes. It's now my primary OS. I'm used to Metro UI already since I have a windows phone. Love the way that I can have my email open in a narrow column to the left and readily reply to it without disturbing what I'm doing on the right.
Yeah, you could snap windows and such, but that just squished everything into tiny windows. Metro actually re-formats the content for the space available. Functional, and not crowded.
I don't know what you're talking about regarding difficulty escaping apps. Don't worry about it. Either grab the top and throw it down to the bottom to close it - use Windows + Tab to switch, or smack the Windows key to get back to the main menu. Any of those will serve you any time in any WinRT app.
And the Desktop? Familiar as before - but still more refined. Love the new file transfer system. Great for transferring HD video files.