We've celebrated our anniversary a couple times at DLR while staying at GCH and PPH. Each time we were given an autographed character photo and anniversary buttons. On a couple of trips, we were also given a pair of latex balloons (did not receive those on this most recent trip last month, though).
Alas, no roses for us.
Happy Anniversary and enjoy your celebration at the resort!
Be prepared for all the anniversary greetings from CMs and other guests while wearing your buttons and roaming the parks.