One thing you may not realize is that a few hundred added on to your trip might be nothing but here's how my trip would look. In March I was able to stay at a modarate resort for 7 nights, had park hoppers, dining included and with flights and a few hundred in souvenirs I paid $2200.
If I wanted to go this year, with the increase in flights (due to fuel costs, for the most part) or driving (in my sunfire...not an SUV) I would be spending almost $5000 for the same trip so it might be a few hundred extra for you but it would be a few thousand extra for me
I'm not understanding the math of how you get a few extra thousand.

I've never flown, so I can't comment one way or the other on how gas prices would effect plane ticket prices.
However, we drive when we go, and we're going from Central Illinois to Orlando. Generally, it takes three fillups there, three fillups back, then one or two fillups there, depending on how much driving we do while there. But if we spent two bucks a gallon one year, then it would seem that at four bucks a gallon another year, the gas cost would be double. So if we spent 500 bucks on gas at 2 dollars a gallon, then at four dollars a gallon, then that would be 1000 dollars. So I'm not understanding how 4 dollars a gallon can add up to a few thousand extra for you under any scenario. I'm not trying to be argumentative, but I'm seriously not understanding how you arrive at that figure. If you have the time to explain how you arrive at that figure I'd be very interested to see it.
But, as for our vacations, if the 500 extra dollars on gas is a major problem, then we could cut out all the Table Service meals, except one or two and scrap the dining plan and just eat mostly counter service. That would save us alot of money on tips, as well as the food itself. Then, we could scrap Sea World (or whichever other extra park we may be considering for that particular trip), which would save over 120 bucks right there. Then we could stay at Pop Century instead of POR, and that would easily offset the 500 dollars more that we paid in gas.
By the way, are you sure that your $2,200 amount was accurate? I'm not trying to call you a liar or anything, but when I booked 8 nights at POR for April 2008, with the dining plan and a one day park pass, the amount came up to more than $2,000. I want to say around $2,200, but my memory is a little fuzzy on that. But I know it was over $2,000. That's only for one night longer than you stayed, and one night is only an extra 190 bucks or so. But even if March was in Value season and not regular season like I stayed in, I'm not sure how your entire trip (including transporation there and miscellaneous spending) could have ended up being right about the same price that I paid just for my room and meal plan.