My absolute favorite "snack" at WDW is the chocolate covered caramel apples. But they're a PITA to eat, so I always just bring one home.
It took me years to try a Mickey ice cream bar, but now I get one almost every day of our trip, so good.
I really liked the Peter Pan float (key lime soft serve with Sprite), looking forward to trying the other flavors.
Nutella fruit waffle, wow. It took me a couple of years to try that, too, so going on my every trip list.
It used to drive me crazy that DH would always get popcorn at WDW. You can get popcorn anywhere. But last trip he stayed home, and I found myself grabbing popcorn a few times lol!
School Bread. I could eat 5 of those a day.