Finally a voice of reason. I'm in the same boat. Linux everything, including any standalone products I can load it onto. I can count on one hand the number of non-linux programs I use. GIMP's interface simply sucks. They know that, they've been given feedback since 1995, they just don't care. @CrypticCoffee is in here acting like GIMP just needs some support from the community but the reality is that they've neglected decades of feedback and so they deserve what they get. If that's negative feedback, then so be it!
Blender's UI used to be a dumpsterfire too, right on part with GIMP in my opinion. They straight up redesigned that shit from the ground up and now it's an amazing and intuitive powerhouse program, and they're 7 years younger!
The fact that GIMP is 2d and blender is 3d works in gimp's favor if anything. 2D is a whole lot simpler, and blender goes into animation, mixing, audio, dozens of specialities.
TL;DR, GIMP has had decades to improve, they don't, and they deserve to reap what they sow, both positive and negative.