"...close up hatches, run blowers or stick their nose inside after fueling..." which is exactly what we teach in boating class. That's the sequence, it's easy, effective, and few do it.
Our local marina dockhands will request shutting down of engines and genset. They will NOT run the nozzle. I think it would be good if they at least looked to see if the fuel was going into a tank and not a rod holder.
I start the blower after fueling and sniff its discharge air. That delays starting the engine and therefore delays being cast off by the dock crew. I ask them not to cast us off till I ask them to.
I've started taking a bight back to the boat and cleating off aboard. Then I'm the one determining cast off.