The line workers seem well trained and perhaps they make their job look easy. Of course if you work with your hands while others are watching, as I often do, it's fun to make it look easy. That being said, look at the intersection between man and machine here in 1936. They already had four hands in a press requires four buttons pushed before the damned thing comes down.
It's probably fun also to show off the robots which the Tesla video did.
Closest I ever got to a monster assembly line like these was helping a plant layout guy from England working on a Jaguar plant. I was just the Autocad guy. He had a funny way of saying Jaguar, something like Jiggy-wire. Cracked me up.
I lived in England for about a year in the late eighties. As I recall, the Brits pronounced it, 'Jag-you-are'.
I live in Dallas now. The natives here pronounce it, "Jag-wire'.
Either way, it sounds strange to my California bred ears. Out there, we pronounce it, 'Jag-warr'.