Out of force of habit, I even put my parking brake on when I pull into my parking space at home.
I park on a slight down slope with the wheels right up against a curb to the front, so there's absolutely no need for me to do it.
But, I do it out of habit, but it's a good thing because there are a bunch of young kids on my court, and I don't want them running between my car and the curb and the car slipping at the worst possible time.