I would hate having problems with a neighbor. It's not like you can just move, or run them off. Only problem I've had is a yapping dog. I have a very nice back yard with a pool and great landscaping; and I love sitting out there. But there was a dog that had an energizer bunny barking. Had enough and I went over there and talked to them and they have since kept the dog inside. I hear it from time to time, but they now yell at the guy and he stops. He needs to be outside sometimes, but they also need discipline.
If I had a neighbor coming on my property I'd call the cops. Neighbors need discipline too.