I am not 100% sure on everything - these are the ones I have used or remember .
You can get room only discounts if they are available. Check Mousesavers for them about 3 months before for the codes. You can also get
DDP without having to buy park tickets.
Also 10% off at the World of
Disney store.
I think there was a discount at some of the restaurants at DTD, I remember getting a discount at puck express cafe however can't remember if it was with my AP or DVC membership.
You can buy the Table in wonderland card too for discounts on restaurants.
That is all I can think off.