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Get this into your thick skull. Ignore Metro. Focus on the desktop mode. If you launch Chrome there it appears just as it did in Windows 7, and you switch tabs, just like in Windows 7. The only time you may need Metro is for launching a program you don't use so often. You can change default programs so you will rarely see Metro. Nearly everything you did on Windows 7 desktop is still there in Windows 8 desktop. Ignore Metro.
But the more apps move to metro, the less valid Thom's complaint is.
If apps don't move to metro, Thom can just stay in desktop mode.
If lots of apps move to metro as time goes on, Thom can spen an increasing amount of time in metro, and his complaint regarding ease of switching between desktop apps and metro apps has less merit as time goes on.