Do them at least once a week to keep elbow, forearm, wrist, shoulder, and biceps problems at bay.
Not curling sounds like a good way to tear up your bicep while deadlifting. Or asking for elbow troubles while benching.
I'm more interested in getting a good pump, then moving heavy weight on my biceps work. Just enough to keep stuff healthy. This way, I can curl without it eating into my recovery.
I include biceps work as an accessory I do at the end of a workout or at home. I treat it like rotator and rear delt exercises. They don't have direct carry over to your lift, but they keep your joints healthy and those aren't healthy it makes it that much harder to get stronger.