Hmm, rarely see anyone around here using a turn signal at all.
It seems to be the more expensive cars have turn signals as an option because the more expensive the car, the less likely it is to see a turn signal used.
Never thought about it though. When changing lanes, I just push the stalk enough to engage the signal without locking it to stay on, then release it when the lane change is done. Never thought to see if it does 3 blinks automatically on any vehicle I have driven.