A few missing details: when you move your mouse pointer on the lower left corner to make the "start screen" preview appears (page:"The Windows 8 Desktop And Task Manager") you can right click the preview which will show you some utilities links (task manager, control panel, run, command prompt, etc), you should also mention the convenient "alt+tab" to switch between opened apps/windows and which is may be more convenient than the "switcher" for keyboard users, also the mandatory "ctrl+alt+del" to reach the logout/shutdown screen.
To give hesitant people my useless opinion as a decade old IT pro working all the day long on the desktop : I don't miss windows 7 at all and I don't think that my desktop productivity has taken an hit: as far as you learn the few mandatory shortcuts you will be more than fine, with the best Microsoft OS to date.