My husband and I celebrated a combo of our 30th anniversary and my 50th bday. At Boma, the waitress bought us out special cupcakes and let us get a bunch of desserts in a doggie bag. Also, we went to the wrong entrance for the Rivers of Light (went to the FP entrance with no FP) The regular entrance was on the other side of the park and we would not have made it in time to see the show. They noted our anniversary buttons and let us in!
Those were the two big things. Otherwise, just a lot of people wishing us Happy Anniversary, which was nice.
I do remember them making a bigger deal out of celebrations years ago (free FP’s and stuff) but that was like 20 years ago, when only crazy Disney fans knew about things like picking up celebration buttons. Nowadays every other person is wearing a button so I’m sure it’s very hard to spread that much pixie dust! We had a wonderful time anyway—but that recognition of a special event is always magical!!