I'm not sure that would make any difference. At most gas stations I go to, people jam themselves in whichever way they fit. And at Costco, where queuing is enforced, people just ignore the filling side and take the shortest queue, and let the attendant drag the hose over/behind their car as necessary.
At the local membership warehouse with enforced queueing, the pumps are accessible from either side and drivers tend to line up with the pump on the correct side.
