@Stuart ********
Sure they're processing many people but there's only 1 (+partner/family)standing in front of them at a time.
I asked if you've seen the terminals because I would think there wouldn't be lists of all incoming passengers expected, but instead, one swipe of passport would simply bring up ALL that person's details. Family too if traveling together.
TDAC, VISA (if any), history of visits etc, About the only things that need to be done from there is for the IO to ask any questions, take a picture, get the person's prints, stamp the passport, and off you go.
Like my experience this past November.