Well in that case I’ll try to make you feel better about my experience with multiple companions.
I go into a tomb and one of my permanent dremoras runs straight ahead into the corridor to kill an enemy and the other dremora stays behind me. Dremora makes quick work of the bandit in a tight corridor, stops and looks at me. I try moving past it but the corridor is really narrow so I couldn’t. I turn around and my second dremora is right behind me and I can’t past it either. They were both permanent so not like I could wait 20 seconds. Not only was it awkward being stuck in a dremora sandwich I also had to proceed to beat one of them to death to move forward.

Just like Lydia when using one follower. However, instead of taking many followers into a tight tomb, you can make better use of them outdoors and without the possibility of getting stuck in a narrow space and having to beat one to death.
Have you ever played the Empire quest line? If so, remember when you explore that dungeon with multiple soldiers? Yeah, sort of like that, except any dungeon any (or most) time. I had no trouble with the npcs blocking narrow ways.