I hate waiting in line, anywhere. At the yogurt store, the DMV, supermarket, the doctor, traffic, and at H&R block. I-hate-waiting.
With that said. The worst place to wait in line is a water park, waiting to go down a slide. You're standing around barefoot, kinda smelly, wet, covered in other people's urine and such. The lazy river is fun. I get it, but you're likely to get Aids. No, I mean HIV (that's the first stage).
So my own personal hell is waiting on one of those uphill/stairs situations that lead to the entrance of a slide, standing in puddles of summer moisture, waiting for a slide they will never let me on...and everyone, including the chicks are hairy.