I'm anal in that department as well, and my wife thinks I'm nuts.
When I am alone I park far from cars, but with the wife I cannot do that.
My wife also thought I was nuts but over time, she has come to see the light and also trys to avoid the potential for door nicks.
This is not a disease, it is taking pride in what you own and wanting to keep it looking it's best since that is what gives you pleasure.