Look at it this way: The barbell curl is like the squat for the arms.
Among other things, stronger biceps decrease the risk of bicep tears while deadlifting/pulling, can help increase chin-ups/rows/etc due to their involvement, stabilize the arms while pressing/benching/power cleaning/etc, and are also nice for the ladies to grab onto.
Heavy barbell curls also help strengthen the grip and forearms.
It sounds to me like adding some in would be worth your while.