I think the main/enforceable concern is parking (unless I misread something). I’ve, at times, checked out, loaded the car in self-park, and headed back to the parks for the day. I can plan around 6pm, but that’s a bit of a bummer because that probably means starting to leave park proper around 5pm to account for delays.
Or will they just start charging hourly at 6?
Incentive for me to leave at 6pm and spend my dinner $$ elsewhere!
ETA: I realize DLGal’s call only mentioned on-site amenities, I just extended that to parking.