I cannot imagine ever wanting to take the inter-terminal train unless I just wanted to take the train. I cannot imagine that it would save time, or save "off your feet" time from just walking.

Since the airport is essentially a loop, I don't think it takes more than a 10 minute brisk landside walk to go halfway around the loop.

Especially when there were landside lounges I could access from time to time (i.e., CO, DL) (but not necessarily one in my departure pier), I frequently darted around the loop.