Filling ANY high pressure compressed gas cylinder is about the same, procedurally. It is just the inconvenience of using high pressure gas cylinders in general that most automotive people object to. Aside from the obvious risks of fuel line rupture and fire, there is the overall bulk and weight of the tanks to take into consideration---all shortcomings that must be overcome(reformers,etc.) before the fuel cell will be a viable alternative to the IC engine.
I, personally, don't see the use of fuel cells in our immidiate future for general automotive use.
Rod