Last trip we stayed at AKV and we had planned for the kids to be at Simba's on three nights. We arrived on a Friday and we had planned for a dinner at Boma while they went to Simba's. We figured if they had a problem we would be close by and could get them.
They LOVED

Simbas. We would picked them up and they did not want to leave.
We had reserved two other stays for them on Wednesday and Thursday night so DW and I could go to EPCOT and California Grill. If the first stay had not gone well we would have canceled these other reservations.
Our last night we had planned a family dinner but the kids overruled us since they BEGGED to go back to Simba's. It was expensive but we are on vacation and the point is for everyone to have fun.
Simba's is now on our must do list. We canceled going to the Princess and Pirates Party to save money. The kids enjoyed Simba's more than they would have PPP. It's a good break for them from the parks and from US.
We would go to the parks as early as possible using EMH. The kids would get tired after 4-6 hours so we would go back to to AKV. Sometimes they would nap. Sometimes not. Usually they would hit the pool then it was time to get showered, dressed and off to Simba's by 4:30 or 5:00.
The kids were almost 5 and almost 8.
Simba's has a buzzer on the door so the CM's know when someone arrives or leaves. They have a little "rope" to get keep adults on one side. The kids seem to respect the rope. There were at least 2 CMs every night. I don't think they had more then 8-10 kids on the busy night and then there were more CMs. The price does include dinners and snacks for the kids.