We are a family of 7. According to Disney's logic, 4 adults and 3 children. Tix to the park would cost over $2000. The cheapest hotel I can find (we would travel in July/Aug timeframe) which would uncomfortably fit 7 would be in the $1000 range (this is taking nothing into consideration, maybe proximity to the parks, just trying to fit 7 in 1 room). We would drive down from Boston as the airfare would be in the $2000 range as well. We haven't had a Disney vacation in over 10 years (when there were less mouths to feed). The kids ask DAILY when we are going and the last 2 kids have never been. My oldest will be heading to college this fall and we would really like to go to Disney before family vacations no longer appeal to him. BUT obviously the expense of a Disney vacation for a family of this size is HUGE. I am pretty frugal and always research my options well regarding pricing. That being said, I would still like to know if anyone has any suggestions on some serious penny pinching in regard to hotel/park tix which is the bulk of our expense here. Reading suggestions, websites, personal experience...whatever you can share, I will appreciate. I love having a large family but Disney vacations are affordable for a family of 4, not 7.
The biggest expense that you can do very little about is tickets. Your budget choices:
-- reseller
-- Y.E.S. (the best budget choice)
The next biggest is lodging. Budget choices:
-- Tenting at Ft. Wilderness (best budget, not for everyone). Food choices limited there. If you own an RV/Trailer it just got better for you!
-- offsite
--- The further away you stay the more you save
Options: House/Townhouse, Condo, Timeshare 'week' rented, Timeshare 'Deals' where you sit through a presentation

, Deals through government-vacation websites, priceline hotel deal. With 7 of you, the best deals you're going to find on a space with a minimum of 2 bedrooms are going to be condos and timeshares. The less talked about condo subdivisions often have the best deals. Here's a resource for you:
http://www.thedibb.co.uk/forums/villa-map.php Windsor Hills gets rave reviews but is higher priced than crestwynd bay. Windsor Hills is #1 on this map, and Crestwynd Bay is #7 and they're very close to each other.
https://www.google.com/maps/d/viewer?mid=z43BYkOGV2MI.kwHIYo5uN3bM&ie=UTF8&t=h&hl=en&msa=0&ll=28.272032,-81.608849&spn=0.068335,0.11055&z=13
I went to VRBO and did a quick search for Crestwynd Bay and found this one for $69/ night
http://www.vrbo.com/334281 THIS IS NOT A RECOMMENDATION. I don't know anything about that rental.
Then you have food. That's easy enough in that you eat breakfast in the condo/home, go to the park, take lunches with you. count on the cost of a locker rental OR carry them with you. If you can wait to eat a later lunch leave the park about 1-2 and eat at home. Come back after supper.
etc. How you space your breaks is up to you.
Our SECOND trip was when DH had been laid off AND we owned annual passes. there's only 3 of us, so I used priceline and got a hotel room on 192 for ~$200/week. We drove. We brought a hot-pot and ate a LOT of cup a noodle meals and kept a cooler full with ice in our room to keep the jelly and pimento cheese cool. We took sandwiches to the parks and to keep from feeling deprived I cooked a bunch of brownies before we left. We enjoyed a sandwich and a brownie in the evenings while watching the fireworks.
We took a case a bottled water, too.
We bought no souveniers that trip.
It can be done but you have to look at all your choices.
it will NEVER be cheap (unless you already spent the money on tickets like we had).