You're right, I haven't given it much of a chance. It'll be re-evaluated time and again as we get closer to release, this is just my feeling at the moment.
With 3 large monitors and lots of multi-tasking, I just don't see this being preferable to the desktop / window metaphor status quo. Not to mention 25TB of files to keep organised.
I realise this will all still be possible by running the "desktop app" (explorer.exe?), I just don't expect to do anything but run that straight away.
Again, I'm sure this will be excellent for small form factor and casual users (provided it's implemented well, which microsoft seems to be putting a lot of effort into), but for someone who uses a desktop for a large part of the day (for both work and otherwise) I don't see Metro as viable.