Cars have horns, and depending on one's location, it is often overused. What is the point of the horn?
When younger, i used the horn as an anxiety release. More recently, a friend that has a horn that really doesn't make much noise, when frustrated really slams the horn. When questioned as to why he does that, he replied that it simply lets off steam. It doesn't really matter if the other person hears it. Good point.
I'm more reluctant to honk. When people honk at me i go on defense, as if the honker meant that honk seriously. I don't want to put others in that situation, so i am reluctant to honk. Recently, when driving with a friend, an older person was cutting into my lane. He told me to honk. I asked what it would help.
Some time ago, someone (iirc, my younger brother) suggested that honking is useless. If against a youngster, he'll just get offended and fight back. If against a senior, he'll get nervous and scared, and probably drive worse until he calms down. If against anyone else, he'll probably suppress it, go home and beat his wife and kids, or take it out on a friend or co-worker. As such, honking has negative implications, and very little positive ones.
There is no question that honking is good at times. The person who backs up and doesn't see you (especially when you are going too quickly to stop out of their way) must be notified about this. A honk does it, and is acceptable for the safety involved. Yet still, when i receive it, i feel the urge to feel offended. It's almost as if i wish there were two horns. One with a loud annoying sound to bother the other person (which of course should never be used), and the other a softer or gentler sound, such as the princess in SMB2, for the purpose of notification.
In summary, i think horns are much too overused, there should be a softer variant, and people should have some other form of stress relief.