When we were there last December, we got the discount everywhere, except where something was already "marked down" (Margaritaville store, the t-shirts were buy 2, get 1 free, and they did not give us AAA discount). We got the discount at every store/restaurant that we went to in both parks, at City Walk, including the Breakfast with the Grinch character breakfast.
The restaurants in the hotels don't give the discount. Emeril's restaurant does not give the idscount. There may be others, but most of the do give the AAA discount. Just ask wherever you go.