Tipping should be reserved for things where you aren't doing the bulk of the work of ordering, carrying food, disposing
of the plate/tray. Turn it into tableside service, and we have a different issue.
Highly annoyed when I walk through a long line at a baseball game to buy a hot dog and drink and am faced with the option of paying a tip for the privilege of being there, ordering, and swiping my card. It's out of hand.