Airport travelators actually slow passengers down.

I never use them. From New Scientist:

Your flight leaves in 10 minutes and you've only just made it through security. As you run to your gate you come to a corridor with a moving walkway. Should you hop on?

Maybe not. People on travelators actually tend to slow their pace, making time-savings minimal, and a new study helps to explain why.

Manoj Srinivasan, a locomotion researcher at Princeton University, created two mathematical models of how people travel on such walkways. In the first, he assumed people walk in a way that minimises the energy they expend, a standard theory in locomotion research. In the second, he assumed people walk in a way that best makes sense of the signals relayed from their eyes and legs.

Srinivasan's models predict that when a person steps onto a moving walkway, they slow their foot speed by about half the speed of the walkway. This suggests that our desires to conserve energy and to resolve the conflict between visual cues and leg muscle signals - your eyes tell you that you are going faster than your legs are taking you - slow us down so that our total speed is only slightly greater than it would have been on regular ground.

This may save energy, but even under ideal conditions of no congestion and no baggage a walkway only makes a small difference in travel time - about 11 seconds for a 100-metre stretch.