First of all, CUTE pictures showing you as a child and then an adult.
Now, I have not read every post in this thread but there is nothing wrong, in my opinion, with taking a day off while they hit US/IOA. It is just one day and you can meet up with them for dinner, perhaps at Emerils or another restuarant at City Walk.
I am a HUGE fan of US/IOA and a season pass holder there and I DO think you could find things to explore that don't involve rollar coasters and drops (especially at US)
1. Men in Black
2. Jaws
3. ALL the shows at US
4. Twister
5. Shrek
etc. etc.
We just went last weekend and had a great time. BTW, there are lots of stores to shop at there too. What ever you decide happy anniversary. I think it is great that your husband has a big heart and is nice to all his friends. I think that shows character, although saying no once in a while is okay too!