Fudge from Goofy's Candy and Karamels form Germany for my coworkers
The kids like the Chip N Dale snacks and Mickey/Minnie "Animal Crackers" (I dont remember the real name) in the boxes for their lunches following our trip.
They also bring back Mickey Chocolate Bars for their friends as souvenirs. We always end up with most of our snack credits on the last day, so use them all to bring home stuff!
I also often get an Aero candy bar from the Twinings Store in Epcot (but I hear they can be bought at some "regular" supermarkets), a caramel treat from the German caramel store, and rice crispy treats. .