My first new truck has had the following happen. Huge patch of white paint rubbed off of someones vehicle onto my door in a parking lot, van backed into my rear bumper and dinged it and pushed it closer to the body, I opened the door at an automatic car wash to insert my money and dinged the door on the kiosk.
You get my point. People are very inconsiderate and sometimes you will do stupid things too if you aren't careful 100% of the time. I even have to watch out at the gas stations as they have these concrete pillars way too close to the pump and you can hardly open your door without dinging it.
If you ever get paint from another vehicle rubbed off onto yours, Meguiars cleaner wax will remove the paint very well. Also buy a bottle of touch up paint and if you get dings or stone chips touch them up.
The funny part that isn't really funny is that you can drive a beat up POS and never have anyone ding you, but buy a new vehicle and you are a ding magnet.
You have the right idea parking in the perfect out of the way spot at stores. I would rather walk a few hundred feet than have people try to squeeze in next to me.
What I don't understand is why people insist on parking right next to someone in an almost empty parking lot and half the time they park so close you can't even open your door. Idiots!