I'm of the same mind as TrikerDad.
I get out there early and carve as much as I can on the steeper stuff, but then when all the yahoos come out, I move to wider and flatter stuff.
Some days crowds are almost impossible to avoid, so I usually wait for a gap, and start carving hard... frequently, most folks stop to watch, but I'll check up hill every other toeside to make sure I'm not about to be run over.
Symetrical, predictable turns in a tight corridor as Dan suggests is also a great defense. Or, if you are lucky, have some skier friends ski uphill of you as blockers!
But when the slopes get too crowded for carving, I switch to my skis and hit the bumps/trees.