I very rarely use the parking brake. Oh, I use it a little more often if its a stick-shift car, but that's only if I detect the parking spot has a slope to it. On the other side of the coin, I owned a 5-speed S-10 pickup for awhile where the parking brake didn't work at all. I made sure to always park in gear, and even more so, to always park with the wheels turned against a curb or something if there was any kind of a slope.
I was watching Drew Peacock on Youtube and he was making fun of someone parking their manual car in gear. Correct me if I'm wrong, but I am sure that's the owner's manual says to do it that way. Plus set the parking brake.