I buy my gas at Costco, where there is always a line. When I'm waiting to pull up to the pump, I get out my Costco card and my Amex, open the door to my gas cap and take off my seatbelt. When I reach the pump, I'm ready to go! I pump it, staying right next to it so when it ends, I can finish up and go.
Drives me crazy when people sit in line for 5-10 minutes, then don't take out their Costco card and form of payment until they get out of their car. Then they put the nozzle in, start it and go back and sit in their car. One day, the person in the front didn't notice her gas had stopped pumping for about 4 minutes. Truly amazing.