We went to AK for my birthday. DH forced me to wear a birthday button (you can get them at all 4 parks). I have to admit, it was really cool! We had an early lunch at Pizzafari. A large group of CMs came up and sang "Happy Birthday" to me, and presented me with a free dessert pizza.
Lots of CMs wished me happy birthday. Once CM seranaded me with a funny song. A CM on PW kept playfully spraying me with a misting fan (it was very hot that day) as the car moved along the platform, saying "happy birthday!" with each spray. It was all very silly and fun, and it really made my day.