It depends on where you are in New York, I lived in Niskayuna for a while, most of them were self-service, but I had at least one or two telling me to get into a line and wait for someone to pump my gas for me. And I just left immediately, next door had the same number of pumps, but no line because it was an establishment that was fully self-service. Meanwhile the one that wanted me to wait in line only had one guy attending the pumps.

I imagine the closer you get to Jersey the more common it is