I'm going in the middle of August with my 5 kids (4 of whom are over 11) and the cost for 7 of us to stay in Disney was prohibitive so we're actually tagging 4 days in Paris onto a Canvas camping holiday. We are using a campsite about 20 mins drive from Disney and we pay for the entrance tickets seperately. Various people told me that the rooms on Disney site were very small for a family of 4 so for my giants we'd need 2 rooms.
We went in August and would love to go again but it is very pricey. Have stayed at Explorer Hotel (cos it was the only place which took five of us) and last time in Sequona Lodge. We travelled on the Eurostar and it cost a bomb but well worth the money. On site was good and we walked down and looked at the Santa Fee which looked really good. Take a good pair of shoes as this is the only time I have been on holiday and lost weight mainly due to all the walking!