For the people who are fast or in a rush it can absolutely be faster, but for people who take their time it can also be a lot slower (old people that stretch everytime they get out of the car, people leaving their car at the pump to go in and get smokes, people hogging the pump while they finish reading/texting something, airheads who have no idea other people are waiting on them etc). It might not be a lot, but it adds up quick. All it takes is a couple slow people and half the station is bottlenecked. I live in PA now and see people do this all the time, but it still tends to be faster than NJ because there's so many pumps you're never waiting on anyone else.