I have a PHEV, so using a charger out and about is silly, but I've only managed to use one pay charger, and it was a lot harder than a gas pump. Even the free ones are hard to use. With the PHEV, the charged amounts are rather low, so I understand the desire to push stored value accounts, but really there should have been colaboration and portability, and at least chargers should have clear information on how to make them start. Go to some website and here's my name on the website. I've seen some that do, but many that don't.
Gas pumps aren't always easy either. I've had several cars where you have to hold it right or the pump stops, but I've never had much trouble giving them money. Also had fun when VW sent out anti-misfueling inserts for my TDI and I got to learn which diesel pumps had unleaded gasoline sized nozzles and which had leaded gasoline sized nozzles; before the insert, the car would take either, after only the leaded fuel size.