I have called Disney, I have emailed them. I have spoken to guards, I have spoken to resort CMs. Each time I ask if I can drive to a resort, that I'm not staying at, and leave my car there while I go to a park. I've been told, by Disney on the phone and via email, that no, I can drive, park, enjoy the amenities at the resort, but my car must leave the resort when I leave the resort.
I've had different statements from guards....some have said sure, you can leave your car as long as you want. Others have said no, move your car before heading to a park.
CMs inside the resort? They say check with security!
Am I guaranteed a specific parking spot? Of course not. But, I don't think that when I pull into my parking lot at BW, at 8:30 at night, I should have to park further away than usual. Then, I look out and see a ton of empty spots at 10. Why you ask? All those folks who felt it was ok to arrive during the day, head to a park, watch IllumiNations at Epcot, walk back to BW and drive away.
I still think they need to make resort lots, that are close to parks (CR, Polynesian, BW, BC, YC) gated. There can be short term parking....4 hrs or less....available for non-guests. You don't see this issue at the S/D resorts. Why? They charge everyone for parking!