It's actually a VERY good idea, Matt.
Microsoft seems to be going farther than that, however. They seem to want us to LIVE in Metro, while the desktop is phased out. I can see no other path.
Trouble is, like you I actually DO use many, many windows. I have documents I'm working on, mail, development tools, graphics apps, reference material, and on and on - all on the screen at the same time. I NEED to be able to see all that stuff,
organized as I need it, just by looking around.
I'm not sure who wants just one app at a time on screen, but it isn't people who do complex work.
-Noel