I've had too many people not signal when changing lanes or turning, causing me to either delay what I'm doing or going to do or take evasive action. I'm not pointing fingers at anyone but most times I've noticed that their attention seems to be elsewhere and they didn't think that signaling would matter - and it didn't, to the car they had their attention on. That's what bugs me!
Not to worry, soon we won't be allowed to drive at all!