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If you look at the movie on the net someplace - its featured on LXer, how multiple desktops are supposed to work in future -- and ask yourself how on earth you're going to explain to ordinary people how to use this thing, its hopeless. Or indeed, how on earth I am going to use this thing myself?
I just tried Gnome-Shell out and well... It really is dead-simple to instantly grasp the idea and actually using those workspaces is so simple you really couldn't make it much easier. As such, I'd say they did reach their goal: make it easy to use workspaces without forcing you to use them.