Strongly agree, actually. I can't ever seem to get fewer than 50 tabs in my browsers, so, must keep alternate browsers installed, to be usable while gaming. However I would say that, most days, Alt-Tab is preferable to things I already know (such as my current workload's constituents) wasting screen space. Everything should be optional in everything, otherwise someone who is right, is going to get screwed.
I'm just saying that if the Start button could optionally make the whole taskbar fade into view without too much shuffle, as an option alongside "Auto Hide" and "Always On Top" that tiny change would virtually obsolesce Metro and Gnome 3. Iterative improvements have barely been tried, instead they just keep hiring an art team for a weekend and calling that "revolutionary UI reimagining."