I have this all the time. I no longer put up with it, if I need to get out or park I knock on the door if I know who it is if not I sit with my hand on the horn until some shifty driver reappears. The last one had the nerve to open my passenger door (total stranger no idea who he was) stick his head in and tell me how difficult parking is and he'd tried his best. He got an earful about how his best would be to park at the end of the road where there was plenty of space as I hadn't forked out for a drive to make his bloody life easier.
I stopped giving a hoot about good neighbour relations when it was perfectly clear that they didn't give a shit. I even had one neighbour watch me walk up her path when she had blocked me out and when I got near her door she dropped and rolled across her living room floor pretending she wasn't in dispite the massive bloody window. I just gently tapped on the glass and asked if she could get up and move her car, she at least had the grace to look embarrassed but not enough to apologise and asked if she could wait until it had stopped raining!
I only bought this house because it had a drive as its a very narrow cul de sac so wouldn't have even considered it otherwise so I'll be stuffed if I can't even use it because some numpty can't be arsed to walk 60 yards. I also get the rage when they use one side all day long to turn around! I've had people parked across it twice already today.
I'm turning into a younger better looking victor Meldrew when it comes to parking 
My fave in hindsight was the couple parked on my drive, I went out to ask if I could help "oh no he said just waiting for me mate!"
"Is is robbing me"I asked,
"err no why would you say that"
"Why else would he be in my house without my knowledge?"
"He's not in your house"
"Then do piss off you cheeky sod this isn't an ncp it's my home"
He turns to his passenger and say bloody hell what's her problem.
I have to laugh, but you may see me on the evening news one night being dragged away!