Part of the problem with GIMP, is the same problem with PS, there are about a thousand different buttons you can click, and at any given time, 3 to 4 different menus you can select from to get to any given option. There's just no good way to design a UI around that lmao.
I was able to pick up PS more so than GIMP, but only because i had an instructor lmao. GIMP is just as bad, except for the fact that it doesn't have adobe creative cloud, and it's actually kind of usable as a result.