We went last December and stayed on site at Coronado Springs-a step above the value resorts. We (two adults, two children-age 9)stayed one week and it was a little over $2800. That was the hotel, tickets, and dining package (one nice dinner and two quick service meals and a snack each a day). The Coronado had a very nice restaurant and their quick service meals were great-some of the others were more like a McDonalds meal.
We have a Diney Chase credit card that gives Disney dollars and I had over $1800 on that-was saving for a long time so that took a big chunk out of it-it worked really nice.
We did rent a car even though we wouldn't have had to. We did a few things off grounds-like swimming with the manatees and indoor sky diving because my husband gets theme parked out pretty quick and it worked out really well.
The convenience of staying right on the grounds is really nice and definitely worth the eatra dollars in my opinion.
The credit card may be worth looking into if you are one of those pay it off right away people. It was a way for me to save specifically for Disney where as if it was just cash back, it would have got spend on something else.