I honked a total of one time since I got my MS, at someone using their phone at a light that was green for about 5 seconds. I felt kind of bad about it because I wasn't being impatient or angry, just trying to inform the person that the light was green, but the tap I gave the horn sounded a little angry.
I don't need the stress of getting angry or making anyone angry at me, so I just do what I can to drive safely by controlling my car instead of trying to make other people control their car the way I think they should. I find that honking rarely prevents accidents, in some cases even confusing the target and making things worse (happened to me once and I was lucky not to cause an accident, because the honker didn't even attempt to evade).
Michigan recently got its first diverging diamond interchange and I saw it for the first time yesterday. Pretty cool and didn't see anyone using it wrong, though I see how it can confuse people.