For me the worst thing is that I get completely thrown out of context. Usually I've got 3 apps open, I quickly need to bring up another window to do something (

For me the worst thing is that I get completely thrown out of context. Usually I've got 3 apps open, I quickly need to bring up another window to do something (say, calculator to do some simple numbers) and now wham! my whole context is gone, my brain is jolted out of the 'flow' that I was in. It's a mental thing so it is hard to explain, but I just find it jarring, unpleasant, and kind of hostile, like someone coming into my office every 10 minutes and shouting in my ear or something. But if you want a practical consideration, the start 'menu' now obliterates whatever I was looking at. So say you were following instructions in a web page (open start menu, type 'control panel', click in menu ...) - well you can't, because the web page you were looking at is not visible now, all you can see is a bunch of stupid tiles trying to distract you from what you actually wanted to do.