Snack credits can be a tremendous value, which we found out! We NEVER used them on drinks! I bought cases of water before our trip when they were on sale at the supermarket, and we brought bottles of water into the parks everyday. So between that and our CS lunch we were covered for drinks. We wanted to sample more of the food at WDW rather than use snack credits on drinks, which was the reason for getting the dining plan in the first place.
Some snacks we loved on the dining plan were the HUGE cinnamon bun at Main St. Bakery at MK, chocolate mousse in France at Epcot, School bread in Norway at Epcot, DH was able to get a churro in Mexico at Epcot but the lady told him they are not normally supposed to be a snack credit, Mickey Premium ice cream bar (at all parks and resorts too), Mickey ice cream sandwich (DS3 loved this!), Mickey rice krispie treat (chocolate coated or plain), yogurt and fruit parfait. I even got a bowl of grapes one time to have a healthier snack! Excellent bang for the buck since grapes cost $3 and change normally there. Other things count as snack credits at resort hotels also. We stayed at Pop Century, and they had things like Uncrustables, lots of different baked goods, yogurt, etc. as snack credits. Also chocolates as another poster above stated.
I was worried before we went that it would not be clear as to what would count as a snack credit. Most things are labeled, especially at the resort they were. If they were not labeled I asked a CM just to be sure and it was wonderful! Would never do Disney without the
DDP! That is unless of course they get rid of it, I am not giving up going to WDW!!!