You are a brave woman! I'd say you deserve a Papal blessing for that.
It's kind of (sort of) fun, actually, although I've turned into one of those surly workers who just dumps a ladle of peas (or whatever) on the kids' trays. The little ones never answer when you
ask if they want a particular item -- just give a blank stare -- so I just plunk it down regardless. Also, now that my son is in sixth grade and is entering the I'm-humiliated-by-my-parents stage (so much
fun), I get a kick out of mock-threatening to embarrass him. I'm usually an "obedient" mom and skulk out without approaching him and his buddies, though.