Aren’t they being extremely strict and not allowing anyone without dining reservations into the hotels? And not allowing anyone to make dining reservations at the hotels that isn’t staying there?
Like
@Magic Feather suggested too, if they do end up checking for your park reservations at the parking booth, then they also wouldn’t be able to get into the Transportation and Ticket Center. That should keep non guests off the monorails... maybe?
(Depending on restricting other things like buses from Disney Springs heading to TTC, etc of course.)