It's been many years since I've used it the last time but I can remember that even the simplest tasks required googling and actively remembering how they were done because nothing was intuitive or logical. And the layer system was virtually unusable, I couldn't figure it out. In Krita or inkscape, the UI just makes much more sense so they are not as infuriating to work with.
That was my initial feeling about GIMP when I first tried to use it years and years ago. After many false starts and head scratching, the logic of it finally sunk in and now I find it pretty straightforward and logical. You just have to find a way to get over the very frustrating hump of understanding its basic design. But if all your needs are met by a program that doesn't demand that initial investment, all the better.
