Yes, you are absolutely allowed to eat and drink while waiting in the majority of outdoor and indoor queues at both Walt Disney World and Disneyland. In fact, many frequent visitors consider "line snacking" an essential strategy to save time and keep energy levels up during long waits. Disney's official policy allows guests to bring their own food and non-alcoholic beverages into the parks, provided they are not in glass containers. While you are encouraged to dispose of trash in the provided bins before reaching the boarding area, cast members generally don't mind you having a snack in the queue. The only major exceptions are certain highly themed indoor areas or pre-show theaters (like Enchanted Tale with Belle or Star Wars: Rise of the Resistance) where there is an emphasis on movement and storytelling, or rides where you are about to board a vehicle where spills could be a safety hazard. Always be courteous to those around you and avoid pungent foods in crowded, enclosed spaces.