The ice cream cookie sandwich is great. You can get one at Sleepy Hollow in MK. Very filling tho. Last trip we ate them mid afternoon and had to call to push back our ADR for that evening. For me this is the best snack in WDW. They also have these in EPCOT but you can't use a snack credit.
Also, everyone loves dole whips in MK.
We also use snacks credits for breakfast type items.
The confectionary has some items that are packaged that you can save for later.