My son turned 9 at Garden Grill last year. We had it noted on the adr, but didn't order a cake. He got tons of attention from the characters, a signed card, and a cake was brought out by Dale instead of the usual dessert. It was a wonderful night!
We loved the food. It was our favorite restaurant of last year's trip (our first ever), and we also did CRT, CP, Donald's, and RFC. It was also the only one the kids asked to repeat, but in the end we ended up booking all new places.