Soothsayer
I agree that Solaris is clever and useful and neat. I also agree that it adds a needless layer of complexity and one-more-thing-to-know when all you want is some dumb exrs with some objects. You don't always need a full pipe studio multiple department all can do context.
In my very limited experience with Lops I've had less context switching and diving inside nodes while working with it.
The time to first pixel is cut significantly. Which results even in faster iterations.
And what I also did not know is how great it is to have a visual dependency graph of a the whole scene at first glance.
I am kinda an one man shop and thought that I could not benefit from usd, but after forcing myself to use it its quite the opposite.