Actually pumping CNG is much safer than gasoline. The CNG refueling system is a "closed" system. It will not allow you to dispense CNG into the open air like gasoline pumps do. If you do not have the fueling nozzle properly attached to the vehicle, the system will not dispense the gas.
I personally have not used the "gasoline-like" pumps, but I've been told they are really slick to use.