Yup, Walt Disney World in Florida. Funnily enough I actually brought you up to DH while there when asking him how far Las Vegas was as I have absolutely no idea how you can live in both places. That said, I always claim to live in Holland & England as I'm Dutch and stay there several times a year too.
We absolutely love Disney, we went on our honeymoon in 2008 (for 2 weeks) and went back for the second time last month (unfortunately only 1 week as we went with MIL & BIL). We love it that much that we bought annual tickets and hope to go at least once more, preferably twice, before June 2011.
I was actually incredibly surprised at how easy it was with an infant. Before we went we were expecting not to be able to do any of the rides or anything and thought we'd just go to walk around, watch the parades, shoot photos and try to finish our pressed penny collection. While there however, Eleanor absolutely loved the heat and was happy being pushed around in her push chair. We tried her on the 'its a small world' ride on the first day and we were hooked to her reaction. She sat so quietly watching absolutely everything (turning head left right and even watching the lights above her) in pure amazement. We went on a bunch of rides after that and have had no problems with her what so ever. Obviously you can't do any of the hight restriction ones, but they tend to be the coasters only. Everything else is very do-able with a young child.
Every park has a 'baby care' area which in all parks apart from Hollywood Studios (we stayed for less than an hour there, no good for young children). There's a room with tv and chairs to just chill, a fully stocked kitchen with formula + meds you can buy, free water and microwave to use etc. Changing area which is really clean and well looked after with around 6 changing tables to use. Most parents aren't aware of the baby care centres so it's never busy! There's also breastfeeding areas. Magic Kingdom has a shared room for nursing mothers only with dimmed lights and 5 rocking chairs in there. Animal Kingdom has nursing rooms with rocking chairs that aren't shared, so just you and baby.
We absolutely loved it all, so did Eleanor. We honestly would go back tomorrow if we could afford it, it only wasn't any less good than when we went on our honeymoon. Every staff member drooled over her as well, having conversations with her, calling her 'princess', making her laugh ... they do make you feel special =) We even got a free drink of one of the staff members!
I'd definitely recommend it, but indeed after school has started again. Our honeymoon was in May, and it was a lot less busy than end of June. That said, we still hardly had to queue anywhere.