I am one of those business users, and I completely agree that jumping back and forth is a royal pain in the a55. However, my statement isn't the contradiction you think it is ;-)
I'm using W8 right now, and it is technically impossible to start a metro app on this installation of mine. That it isn't possible to spend 100% of your time on the desktop without accidentally falling back into a metro app is a common misconception, and probably responsible for most of W8's image problem.
I've previously explained it
here.
I recognize that the average consumer probably has little chance of figuring this out for themselves, but companies should have IT support staff that understand how to setup a W8 installation accordingly. Training users then becomes simple as pie, because W8 then feels exactly the same as W7, with the exception of the start screen, which most instantly recognize as being a larger and better replacement for the old start menu.