I'm noticing lots of people with both the opinion "I don't think I could work under a boss" and "hierarchies are efficient". But there's a tension between these two.

Efficiency properly understood isn't output per man-hour, it's output per unit unpleasantness. That follows from standard econ definitions of efficiency.

Hierarchies doesn’t always necessities *feeling* of having a boss. With proper management (or lack of it) people can feel intrinsically motivated to do their work.

Examples: work of Jos de Blok and Dee Hock.