Neither myself nor my family has ever used the DDP before, we can only hope that the changes made will have a slightly "negative" effect on crowd levels at various dining locations. It's been virtually impossible to get in to eat anywhere without having reservations months in advance, due in large part to the DDP.
As my family and I all hold annual passes, we're not the type who book ADRs months in advance, usually we wind up getting our hotel and travel plans together about a month or so before we actually arrive there. Don't get me wrong, as I want other people to be able to enjoy their vacation, but at the same time I want to enjoy mine. Hopefully this ADR months in advance malarky will taper off (doubtful, but hopefully) and some of the spontaneity of dining can come back.