As a "bumpy" driver myself, the only things that really made me more careful about it was 1. being regularly chastised by my husband, and 2. getting a new car (Ratbastid's Miata). My car, the brown ugly one, was already kind of dinged when I got it, and while I didn't go around playing bumper cars on purpose, if I happened to bump into someone's car in the parking lot, I wasn't going to freak out. It doesn't really do anything in terms of damage. But in the Miata, on the other hand, I was very careful. We were leasing it, so there was that, but Ratbastid would kill me if I scratched it. Don't know if that helps in your situation, but getting a new car made me a much more careful driver. In parking lots, at least
