we used the dining plan in december and i would do it again.
but, it was easier for me to help plan and save. plus, i liked the fact you could use them at the outdoor carts, you can't use the cards there.
we had 5 of us (one 2 y/o at the time) so i paid for 4 people and we only got it for 3 days of a 5 day trip.
we didn't have any left over, but we ate in the park a lot. it was warm so we bought lots of water and soda at the carts.