I've had tons of mac users go goggly eyed over how well gnome3 handles multi monitor (automatically creating profiles for different monitor sets that are plugged in, and remembering exactly what it's supposed to do under various circumstances with zero setup).

Caveat: It definitely does the magic best with an intel graphics chipset, because proprietary blah blah blah

Point is, if you are referencing projector problems, you're talking about a far away time now...