We did the FDP on 6/5 at H & V...when it came time for the CM to give us the bill, DH, not knowing any of the terms of the DDE card, just put the letter in with the room card and when it came back it was adjusted to the 20% savings. After realizing what he did, I told him technically the FDP wasn't to be included. Using the DDE card, he still tips based upon the bill prior to the discount so our server wasn't slighted at all. He just sheepishly grinned and said to me, "Guess the Disney magic is working today."
So, it was not expected that we would get the DDE discount, but we happily accepted in when it was given. We in no way intentionally tried to sneak in a discount...DH just was clueless since I am the one who always makes the arrangements for our trips...he likes the "no worry" mode for vacation.
As for the seats...they were decent! Just glad I didn't have to wait in that long line with the rest of the park guests for Fantasmic.