For me, it's not even more clicks. But then, I've always used Windows predominantly with hot keys, not the mouse, and with pinned (or shortcuts prior to Win7) apps or "WinKey+type command" rather than using the start menu. So I've got less retraining to do than some. In the end though, it's not just "usable". There's no loss in productivity. That doesn't mean I think Microsoft made the right decisions. From a UX standpoint, I can't stand the loss of affordance and discoverability. For enterprises that is going to mean higher costs in training, and an initial loss in productivity while employees are trained. In the end, though, there is no loss in productivity, much less usability.