We just got back from a trip in March/April. My boys are 10 & 12. Though, while neither of were excited about going to the character meals, they weren't vocally opposed to it either.
First day we went to Minnies. DD had pictures taken with all of the characters who came by, and some with multiple poses! DS1 made sure he had picture with Pooh (his favorite, and he's 12!), and then both boys had pic taken with Max and Captain Hook. For the most part, they ignored the characters as they came around. We sat in a booth, so DS2 sat on the inside of the booth so not to be in the line of sight of the characters. The boys are both BIG breakfast eaters, so I thought this was a good option for them, as they had lots of really good food to eat.
That evening, we had DD "done up" at Club Libby Lu and then took her to the Princess Dinner in a Mulan costume. This is the second time we did this for her. Like last time, I made other plans for the boys during that time. The only bummer for us was that Daddy didn't get to see the little princess enjoy herself. It was just a "girls" trip, with DD, me and Nana. Papa and DH and the boys went to Naples.
The final day, we went to Lilo and Stitch breakfast. On that day, I gave everyone a choice. I was taking DD, but everyone didn't need to go. DS1 and I and DD went while DS2 and DH packed up the car. They then met us at BaB before we headed out.
We have a challenge, honestly, whenever we go out, balancing a "great time" for all. The boys are older now, and close in age, and then their sister is really their "baby" sister, even still at 5. There's 5.5 & 7.5 years between them. One of the things we do is plan time that we think will be special to each of them during a trip. And, for us, it's okay to spend some time apart. I think three character experiences would be a bit much for the boys, but having their "guy night" gave them something special to look forward to. I've been told next time that they want to do ESPN Zone, instead. I try to plan things that I know will capture all of their interest, but perhaps in a different way (like the character breakfast, focusing on the food for the boys and the characters for DD and Build a Bear.) The boys also did Jedi Academy, and really looked forward to it.
And, bad behavior and ruining other people's fun=taking away privileges in our family. And, I have no trouble enforcing it.