I don't think an auto shop has ever damaged my vehicle when working on it. And I don't drive "high end," just basic stuff like Honda Accord, Ford Ranger and now a base model Nissan Altima.
Fortunately, the A&Ps / IAs that I have used on my Mooney have not caused cosmetic damage that I've noticed. It was painted two owners ago, sometime in the 90s, and I think it looks pretty good still. I have had to ditch one shop due to quality and quantity of work, doing unapproved work, and stupid rates [we took your wheels off, decided your bearings are bad, then put it all back together. We want to charge you to jack up your plane, remove, clean and disassemble the wheels, replace & lube the bearings, then put everything back together.] After that experience, I needed a Ferry Permit to go to Joey Cole's and have the plane rerigged; he said I was lucky the gear came down to land, to say nothing of how out-of-whack the elevator was. [dumbass replaced the tie rod ends when I told him not to, because he didn't have rigging boards to make sure everything was right.] So far, four good ones and just the one bad apple.