Speaking solely for myself…its an analgesic. You don't have to think.Dunno how people work in factories, doing repetitive work much like a machine.
I did seven years for UPS in the Ontario, California air hub. My actual job required a bit more thinking than what UPS hires for, but was repetitive nonetheless.
I was hired as an unloader. Basically, the trucks and air containers roll in, you go inside and unload it on to a slide or rollers that connect to a belt. It's simple, all you have to pay attention to is making sure you aren't tossing packages. When that's done, you unload the next. You aren't really thinking about it.
I got into physical shape fairly quickly, but they (UPS management) decided to put me somewhere else about three weeks into the job. They put me on Irregs/bulk. This is stuff that can't go down the belts. Car parts, wood or metal boxes, styrofoam boxes, coolers, tires, oversize boxes, fishing poles, etc, etc.
You stand at the END of a belt or slide for this stuff and you load it on to a bulk train (five carts connected to an electric engine). When it's full you drive the train out and deliver it to the air containers on the other side of the hub, unload it at each belt or truck station and then return for more. It meant knowing the 'sort', the zipcodes that determined destination.
Once I learned the sort and how to drive and I already had the muscle memory and physical strength of moving the packages, it was all as you said 'machine'. I could think about whatever I wanted because everything was automatic. I clocked in and my brain checked out. I got paid and didn't have to remember much about what I did to get paid.
Which is one reason I avoided load side. On load side, you have to think. You're loading air containers and it's a 3D jigsaw puzzle with packages constantly coming at you.
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