In general, I'd say it's worth it; however, on our last trip back from SXM through JFK, about half of the GE kiosks were not working. And now, more and more people are getting GE, so there was a back up. It was the first time we experienced that problem. I do think we got through much faster than those who didn't have it. I think 4 planes landed about the same time as ours so there were a lot of people going through Immigration at the same time.

The is also a dedicated exit for GE holders once you pick up your luggage too. It's not well marked, so you have to be on the lookout for it.