I disagree wholeheartedly! Yes I look like an idiot trying to get my bag up the gangway, yes people watch and laugh at me, yes it it a pain in the ass. But 99.9% of the journey to the ship is not the gangway. And lugging a bag with no wheels through the airport sucks.
Plus getting rolling luggage 100 feet up the gangway is much easier and less comical then watching someone try walking a duffle bag the 100 feet down the center aisle of an airplane without hitting sombody upside the head.
P.S. I rarely find the need to use the gangway anyways. Depending on the ship there is oftner either a crane running, or a sallyport open or a stern ramp or a ladder set up on the pier. Hell some ports now use movable elevators instead of gangways.