You will tire of rubbing elbows with the same people. If you don't get along with a coworker, it's impossible to get away, and even more impossible to not work as a team without antagonizing the relationship further. Once you're on the clock, the close-quarters environment forces you to put the drama away for the sake of the job.
The work gets horribly monotonous, but that's the case with any procedure-based work. There is plenty enough food to mix the work up, but only for a few months, until you've mastered putting together every possible order. The drinks, for example: grab a cup, put the sugar in, put the cream in, pour the coffee, stir, lid, hand to the customer. Repeat, repeat, repeat. Seeing the same customers ordering the same orders, hearing the same voices through the drive-though speakers, listening to the same phrases uttered by the same coworkers--all while the oven beeper rings, the iced cappuccino low-mix-level beeps, the meat warmers beep; it's enough to drive some people just a little crazy. Take it from me!
Oh, and there's little-to-no room for self expression: you wear the same uniform as everyone else (unless you're a manager or a supervisor--both of which have their own designated uniform), you must be clean-shaven, you cannot wear earrings (at least my store didn't allow it--said they can fall into food), you cannot have tattoos visible (pretty much a societal custom, anyway, but still). After you've followed all the formal regulations regarding uniform and appearance, there is little in terms of visual appearance separating you from your coworkers
