Thanks for getting what I found difficult.
As I said, the people looked the same as in other shops around here, that is, not bad at all. Maybe albuquerquennes are tidier folks. They were just much faster coming around corners - probably a human trait where stores are huge to start with and aisles are wide, and the route to the registers can be a speedway, or not, depending on individuals and store crowding.
I've written about going through the LA interchange - going from freeway to freeway to freeway where you pretty much need to know where you're going to get there without missing an exit or two - at eight on a sunday morning. Every car on the road at over eighty and some way higher. I was proud of myself for my navigation. My point - it may be that when the store is less crowded that people 'cart' faster.
One thing I learned - if I want to cross in front of the building, I'll never do it again right in front of the building. Criminy! They could almost use speed bumps.
More on the people - I haven't read back and may have said this already - the one walmart person I asked where something was, was friendly and not in that 'you'd better be friendly' way. The clerk at the register was neat, we had a conversation about allergy season.
So, I put down my discomfort to system design relative to human behavior. I studied that once a couple of decades ago, interesting subject.