I usually walk/climb, but when I have a rollaboard behind me, I'm always sure to move to one side and put my bag on the step behind me. I even check others ahead/behind me to be sure we line up on the same side, leaving a path.

I realize that I'm in the minority and do wish others would extend the same courtesy. It's just one example of the general me-centric/oblivious-to-the-world outlook I see just about everywhere.