I use them about 95% of the time. I dislike when drivers decide to change lanes without using them, but I really really really HAAAAATTTEEEE when drivers wait and wait and then turn it on as they make their turn. FUCK YOU, YOU STUPID FUCKING ASSHOLE! It pisses me off so much because more often than not, I notice it because I'm trying to turn and they have the right of way. Like, getting out of a parking lot and some ass is coming so I wait, and then what do you know suddenly he slows down and turns into the lot. I could have gone but now I have to wait as the 15 cars behind him go by. Fucking shit head.
I hate it slightly less, but the people that have their turn signals on when going straight is nearly as bad. I almost turned left in front of a truck because of this, but I thought it strange how he wasn't slowing... Stupid ass.