I hate drivers who go to the first pump they come across. At our local BP there is 2 rows with 3 pumps on each row. These dimwit drivers use the first pump they come along leaving 2 spare pumps in front of them. Obviously you can't get past because it's so narrow and full of cars, so as soon as i can, i get in front of said dimwit and proceed to fill up and block them in at the same time until either i finish and go, or the drivers in their cars next to us go.
I've even had confrontations with people asking if i can move forward whilst i'm in the middle of filling up.
Them: "can you move your car forward mate, you're blocking me in"
Me: Well, if you would have used this pump in the first place, then i wouldn't be in front of you would i? DIMWIT!!
It's simple. Go as far forward as you can, and other motorists can use the pumps behind you. Chances are, you'll then be in and out before them and nobody gets blocked in.