To say that Win8 is anything but a slightly better version of 7 with a new start menu and upgraded widgets, that are just as useless as the old ones, is ridiculous.
No one said the start menu in previous versions of Windows was more useful necessarily, that's a different argument. I don't agree with your conclusion about context switching but I don't have a formal background in user interface design so I'm not going to argue it further.
Playing: Dark Souls 2: Scholars of the First Sin Watching: Mr. Robot