I've only been on the road for a year but I haven't even used my horn yet, I just curse to myself or the other day I raised my hand in exasperation at the driver of a fwd who decided it was ok for them to try and merge into me from the turning lane grr.
I would never get out of the car and I now drive with my doors locked after witnessing some scary stuff on the road. A couple of weeks ago I was behind 2 cars at a round about, a person got out of the car in front of me and ran up to the car in front of them banging angrily on their window trying to get them to get out. They drove up onto the curb and the other car followed them. I didn't hang around to find out what went down, I got out of there (not willing to get involved with my kids in the car with me)