I'm a teacher, too

It's a great job for parents

My husband often says he should have been a teacher then we would have ALL of our holidays and summers together.
First of all....you WILL NOT be missing out on the Disney magic by staying in an RV at the Fort. NO WAY!! In fact, there is soooo much to do there that other resorts don't offer.
The Chip n' Dale Campfire is GREAT!!! Our kids loved it! Get there early and grab a front row seat. You'll have fabulous interaction with the characters, and lots of family fun. Of course, the s'mores are a big hit, too.
At night, go down to the beach and watch the Electric Water Pageant and the fireworks

Again...more awesome family time! And very relaxing if you get there early and save a lounge chair.
You can rent bikes or bring them (not sure if you are driving or flying). There's a great path/trail that leads over to the Wilderness Lodge. You can walk or ride bikes... just no golf carts
In the afternoons at the pool, they have games for the family. The pool is very large, so even if there are lots of people it's no big deal.
Have you been over to the Camping Forum on the DisBoards? They are super friendly and know LOTS of "dos and don't" about RVing.
No worries about not enjoying the Fort

Your family will have a great time there...promise
Happy Planning!!!
WOW!!!! That's really quite an accomplishment.