I do a lot of 'proceduralised' jobs, but I'm 'lucky' in that I get to define and hone the procedure and then it tends only to be necessary for a few hours or a day or three, before I move onto something else entirely. I get a wee quick out of making things more efficient, then get to move on before my brain calcifies.
The thought of acting a mere part of a machine for 8 hours a day, weeks, months and years on end is ... well, it makes me appreciate my job, even at its worst!
Interestingly, Toyota's factory culture is very different. It's part of company philosophy to seek continuous improvement. They're also big on cross-training and investing in staff. Basically, they respect that hands come with brains, and that it's worth engaging both. I suspect I would have enjoyed that much more. If you're curious, the This American Life show on NUMMI gets at the contrast between the two approaches.
I no longer remember what the meeting was about, but I think it must have been related to why the company couldn't afford a raise people were expecting. Somebody asked him a question that I couldn't hear; he looked a little flush and responded quickly, off the cuff. This guy who was wearing a nice suit, this guy who had clean hands and no burns from the presses, this guy who was easily clearing 10x what his workers made: this guy said, "I live paycheck to paycheck just like you all do!" And implied that he was just helpless in the face of his wife spending to much. Everybody in the room scoffed at him. I'm still scoffing.