I know it's late, but between four of us and some unused meals due to meal splitting on my parents' part, we had like 42 snacks left on our September trip. We got a bunch of chocolate treats-- peanut butter cups, turtles, etc. at the Goofy's Candy Shop and the other candy store at DS. My mom finished the last peanut butter cup around Christmas. (Had I realized she still had it, it would have "disappeared" before then!) My sister and I packed them in our carry-ons and ate some as lunch on our leaving day.)
They travel well, although in the future, I'm totally bringing some ziplocs or gladware-style containers for travel purposes. The clamshells Disney gives you tend to shatter.