We've stayed at ASMu once and ASMo twice. We really enjoyed the value resorts! Our stay at Music was 10 years ago, before the Movies resort and before we had kids. We were in the Calypso building, which is now preferred. It was fun, but I don't think it would be as appealing as Movies to children.
We really loved the Movies resort. It is newer than the other All Stars. Our first stay, we were in the Love Bug building. Last fall, we were in the Buzz Lightyear building. We had requested to be in the Toy Story section, because my DS3 was a Toy Story fanatic. He was in heaven all week. I've said to others that he was happier there than he would've been in a suite at the Grand Floridian!
We had great experience with the buses -- never had to wait long. Most of the time a bus was waiting for us. The gift shop is great -- we quickly learned we could buy a quart of milk there for less than two 1/2 pints in the food court. The food court, tho, is good. We ate 2-3 meals there. We never experienced large, unruly crowds there. In fact, we are upgrading to a deluxe next time, and DH says he will miss the food court! Go figure!
We only visited the Fantasia pool at ASMo. It's large and has a statue of Scorcer Mickey that shoots water, but that's the only "theme." Still, it was cool after a long, hot day at the parks. There's also a baby pool, but we didn't venture over there. There is a playground. We walked by it everyday when we were in the Buzz building, but we never played. Our kids weren't too interested, as it looked like playgrounds in our local parks.
I had read opinions of some that people who stay in value resorts are treated lesser than those staying in mods or deluxes. I never found that to be true. The CMs at the resort were wonderful, helpful, and very friendly. The only issue we ever had was that mousekeeping would only leave 3 sets of towels when there were 4 of us in the room ?! After calling back to mousekeeping the first couple of nights, we were brought a stash of extra towels & wash clothes.
I have heard good & bad reviews of the values, but that's also true of the mods and deluxes too. Just go with the attitude that this is going to be the best vacation ever and it will be!
Have fun planning!
Christy