GIMP should take a lesson from Blender. Blender used to be the most clunky, unintuitive pieces of open source software. But after a decade and a half of UI development, it's one of the smoothest interfaces you'll ever use.
Agreed. I'm already willing to use GIMP in its current state. But though I've used it since I was a child, I have to re-google for things I know it can do.
I had a photo of a barn. I was going to construct it in miniature, so to get scale measurements I wanted an isometric perspective from a photo that had been taken at an angle. I had done this in GIMP before so I was hesitant to start googling for answers but in 25 minutes of playing with it, no combination of inputs would do what I wanted. I had to find some youtube tutorials.
Even simple tasks aren't simple. Annotating a photograph with a couple red arrows is a multi step challenge involving paths, stroking, selections, layers, and maybe some other stuff I'm forgetting. These UI concepts were impenetrable without tutorials -- I never would have figured this out on my own.
GIMP has helped me but it's never been pleasant to use.
We want to make macros simpler (some of the work I helped out with for GIMP 3.0 was to lay the groundwork for automated/recordable operations), but as with all the things on our roadmap it takes time and developers.