How often did you visit the concierge room? Were there good selections for dinner or did you have to purchase meals for dinner as well?
Personally I think the concierge food is probably at its most useful in peak season. As they serve appetisers from 5-7pm and the room closes at 8pm each night. When the park closes at 8pm you don't want to go back to the concierge room between 5 and 7 really, but when it closes at midnight it would be fine to do so. The appetisers were the same spring rolls each time we made it, plus some cheeses, crackers, and chocolate dipped strawberries. Plus glasses of wine and beer but service on these were slow we found. I think they do do different hot appetisers but the nights we went in it was spring rolls each time.You could exist on this as dinner I guess and we did one night but not every night I'd think.
We ate breakfast there each day. The breakfast food was the same each day, 4 cereals, all but one quite sugary, bagels to toast (sweet as well), good selection of fresh fruit, muffins and pastries. The pastries weren't very nice and I usually like that type of thing. I like my kids to have as sugar free a breakfast as possible even on holiday (I'm less strict later in the day, honestly

Snacks to take to the park are potato chips and apples really. They have nice cookies too but they aren't very portable, unless you plan in advance and bring something to carry them in to prevent breakage from home. The bottled water was good but you could just buy a slab or two from the supermarket and BYO or get it delivered to your room. There is a fridge in your room so you could just BYO cereals and milk for breakfast in your room before you hit the parks. My kids didn't like the fruit punch they had.
The staff were helpful, it was nice to borrow DVD's to watch, and making bookings for dinners etc was easy, no long waits on hold on the phone.
Would we use it again? In peak season maybe, in off season unlikely.