It has very little to do with security though. I usually go through security in 5 minutes at my home airport. I do leave a lot more time than that partially because my car company sort of insists on it. (Of course, the car company is another cost.)

Honestly, it would be faster and possibly cheaper for me to drive to Manhattan than take the train--in which case security doesn't enter in at all. And certainly for two people. But I hate driving into Manhattan.