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I have been using windows 8 since March and by now am quite used to accessing all the options using the Windows key and/or the mouse.
If I need to work with apps from the desktop I use the Windows + D key that is as fast as moving the mouse and clicking on Start or an Icon.
If I want to brose the Internet, check the weather, the stock market or the news, I like the live tiles and being able to access them directly from Start.