I think it has more to do with lighting as well as the height of the ceiling. In NYC the escalator going to Grand Central Madison is very long and yet it doesn't feel uncomfortable at all. It has way more lighting than your picture and the ceiling seems higher too.

Do you feel nothing at all when you're on a very long escalator and you look down? What if someone pushes you, or a person behind you? People would fall like domino.

no it doesn't. long escalators are just really fucking scary. regular length are scary too, so it just follows