I think a lot of that is probably Florida campers. If you're close it's a lot easier to justify a bunch of trips. For us, a 10 hour one way drive more than a couple times a year kind of kills the magic for us. Your mileage may vary. At my job I get 4 weeks vacation annually currently. Wife doesn't work, so getting time off is not too much of an issue. Our girls are in a half-homeschool/half-public school program (they are in 2nd and 4th grade) that is flexible where we can take off a week at a time even during the school season, so you can bet with the way the prices are now we are watching for the lowest cost days at the fort, balancing that against the super-hot summer weather. 🙂 We have two trips this year, one in May which is 4 nights and another for a week in August. Cost of fuel is a major deal since we do a 1400 mile round trip tow for each trip down to central Florida, so being able to cost-average the fuel costs over more days is a must. The first half of the May trip we are staying at a much cheaper campground for three days away from Disney and then driving an hour over to the Fort for the second half of the trip. The week-long trip we were able to get a deal on a Premium site that was almost as cheap as a partial hook up loop (using the Sun and Fun room offer), so deals can be had if you book early and can be flexible. I agree the prices are getting out of hand though.
We save up our credit card points for Disney to offset the cost, which helps. I have "gamed" the Disney Visa a few times when they've had the $200 gift card promos by signing up for new cards in the past.
As far as visiting the parks though, that's another story! We haven't done a multi-day park-hopping extravaganza in several years. Been there, done that... a lot of fun when we did but on top of being expensive, we have realized we're getting older and it just wears us out and we get tired so we typically limit ourselves to 1, maybe 2 single park days on any trip lasting a week. We love the Fort and visiting the other resorts and buying drinks and snacks when we're not penny pinching theme park tix. We bought season park tickets to the water parks last October which are of course still good til October this year. We love the water parks and for the most part they are MUCH more relaxing than the theme parks are. We don't plan to visit any of the normal theme parks at all in May, and we're only going to do the Not So Scary Halloween Party in August. The water park tickets will still be good for both trips, so that helps a lot on the cost. Again, that was cost-averaged for several park visits over three trips and it's just a little more than a single theme park day's ticket cost for each person and is good for a year.
To save money in the past we have also tent camped several times instead of towing our camper down in the cooler months (late Oct-late March). For those trips we can use our Prius which gets about 42MPG on the highway, vs towing our camper at 8MPG.
We have said this several years in a row now that this will be our year visiting the Fort for a couple years. It's not a stretch to say that it's getting to the point where it's not worth it. I have a feeling this year might be the last for a year or two for real though. I know this is cynical and a bit mean-spirited of me but Disney World is lots of fun of course and I always say there's nothing wrong with Disney World that a "good" recession wouldn't cure IMO.
EDIT: Oh yeah, most importantly for a few trips, our camper has three queen beds, so we have been able to split costs between our family and another on several trips! Sometimes with family, sometimes with friends. Our girls are getting a little too big to split a bunk more than two ways though, so I think those days are over, unless we split a tent site with separate tents.