As I don't use escalators to get to and from a railway station and then my workplace and so not in a hurry, I am usually content to stand aside on escalators and let others pass me by. It is a bad attitude, but why walk up or down when the moving staircase does it for you?
I wrote about which side to stand on when using escalators and it certainly varies around the world. Post was here and a later bit here.
So perhaps people complaining in forums about 'foreigners' standing on the wrong side of the escalator need to take this into account. Nevertheless, if you are in foreign country, you should observe what the locals do and take their cue.
There is no doubt casual visitors to the City are the worst offenders. Mix casual users with peak travel time train users, such as Melbourne Central Railway Station, and there is real conflict. One aspect of the problem is the slowness of escalators. They are painfully and un-necessarily slow. If their speed was doubled, many people would not need to go dashing down escalators and casual users might be a bit more focused when they used escalators.
But why oh why aren't there signs telling people to keep left on escalators? It just seem to be so obvious to have visible keep left signs as you ascend or descend on an escalator.