Somewhat. Like most people who mess with lifting, the curl was one of the first things I tried and kept with. It certainly helps, but in the grand scheme of things, it's pointless unless you have hours a day to dedicate to lifting. I'll still throw in the curl now and again, but I find that there are plenty of other exercises that work the biceps and target other muscles, too.
I know there aren't too many guys that don't like a nice-looking bicep, but if you're lifting to build better strength, it's best to stick with the exercises that work a group of muscles and not just one.