No, before GimpShop, I’d argue Gimp has had the worst native UI/UX I’ve used next to Blender, and I mostly do UI/UX for a living.
Bizarre keyboard shortcuts, awful ‘stay-on-top’ window behaviour when tabbing between applications. ‘Copy’ copies the inversion of the selection by default. Dragging a selection drags the rest of the image. The default behaviour of most tools is inverse to any previously established behaviour.
I’ve used Gimp thousands of times over 15-some years, in some cases for professional projects, and under the hood it is very good, but for many years it’s UI/UX made it literally the most bottom rung tool I would possibly choose to use for graphics manipulation - only when I absolutely had to. (I remember using Gimp in between the PowerPC -> Intel transition, where CS2’s performance on my Intel Mac Pro was worse than my iBook, and Gimp had a Universal Binary before Adobe did...)
I learned GIMP, through tooth and nail, and, knowing it well, I can still say through and through, especially historically, Gimp has been nothing short of a mess to use. I’m still not used to the idea that selecting and dragging something moves the rest of the image, not the selection itself.
I don’t want to learn to make an exception for Gimp as opposed to every other graphics application on the planet I’ve used since MS Paint, and I am certainly not the only individual criticizing particularly the glaring UX issues within Gimp.
Now, Blender, I’ve tried to take a dozen or so YouTube tutorials, and read dozens of articles on, and it just makes me want to hurl my MacBook Pro across the room every time. I was never able to accomplish anything serious in Blender the way I did with Gimp, which is why I put Gimp as the second worst UI/UX I’ve ever tolerated.