One only needs to look at how professionals operate to find already iterated to a close perfection user interfaces. Take a professional kitchen at a restaurant and compare it with a gadget filled home kitchen.
A classic example of this is the situation where an experienced cashier on an "analog" system can just fly through the buttons and complete transactions in no time, while at the same time a rookie would take that much more time to ramp up, figure out, and internalize the various button mappings. A darker interpretation of this would be that the system is optimization for fungible workers, where swapping out one cashier at will for another has negligible impact on productivity.