An escalator or moving walkway offers two possible benefits; saving time or saving exertion. I completely agree with stand right and walk left but sometimes the escalator or walkway is too narrow to allow this. I almost never walk up an escalator because I have a roller bag with my flight bag hooked on the back of it. There is no way I'm going to stop, separate the two bags and carry the 50 lbs. up an escalator! Unfortunately the width of my flight bag effectively blocks the left side of the escalator so all I can say is, "too bad". I don't mean that in a rude way but it's as if you got to an elevator in a big rush to go up but I had already pushed the button to go down, "too bad".