Here in LA, almost nobody uses them (turn signals) and yet everyone says they are GREAT multi-taskers! It really makes me wonder?...And yes, I too DESPISE people who don't use them. I always joke with my son telling him I guess their car didn't come with blinkers. Or joke to myself that it must cost $ to use them or something.
I'm thinking of making a custom bumper sticker. It will read...
"You Multi-Task? You Can't Even Drive AND Signal!"
On second thought, maybe not. I don't want to be shot at!!