Destroy the establishment! Curls are for curl bros. Curls and bench press are the two exercises the machine monkeys do when they accidentally wander into the free weights area.
Honestly I feel a little bit embarrassed doing curls. There's no way to do them and not look like a poser. Maybe people use the squat rack to try and hide...
I don't really know why I hate curls and bench so much. I just feel like they aren't helping me do anything except not fit my shirts properly.
Anyway, for the OP:
Rows are an alternative. Upright, bent, seated, whatever. All works biceps ++.