In Japan, they do not.
Above is a video from the Narita airport near Tokyo which shows the escalators to the gates. They run at a very slow speed, just enough to overcome the inertia of starting them up. When a passenger walks near the escalator platform, the rate increases and the escalator runs at full speed until 30 seconds after the passenger leaves the escalator. Here's a link to another example from the Seoul airport.
The end result is that energy is only expended when its needed.
It's this kind of creative thinking - using energy only when its needed - that defines our green power future.
On demand escalators - that's cool.