For what it's worth, we just bought an RV. Best thing we ever did. Great family memories in the first year.
We still like to go to Disney.
No matter what your initial math might suggest, RV's aren't a cheap solution.

I love ours, but they aint free.
I do think there is a point where you can over do it with disney.
As a semi related topic. There is a RV rental company that has a location in Orlando. They sell their retired rentals, and they will pay your airfare to come get it. We very nearly did that, with working in our first camp at ft wilderness. Unfortunately, it didn't quite work, we ended up buying from the same company at a Virginia location.