I've done it, but most of the time catch myself before I do it. Lol! It is especially hard because I'm driving a Jeep 97% of the time and I've driven Jeeps for over two decades. That is one overdeveloped habit!
All the time... force of habit.
I realized I was doing it when I was driving with my wife in her Forester -- she saw me Jeep-wave and she said "Who was that, do we know them?"
Like I said, it's a force of habit and part of the club.
And it still happens when I'm not driving my Jeep.