Thanks for the really comprehensive reply. The feeling I’m kind of getting from these comments is that neither GIMP nor Krita is really capable of acting as a replacement for Photoshop yet. I know that GIMP is capable and fully featured, but when I last tired it, I could not bear how much it crashed or locked up, and like you implied, the default UI is absolutely fucking garbage. Being totally honest, I don’t think it’s defensible how bad it is - Photoshop lets you customise the UI way, way more than you probably think, it has easily half a dozen preset layouts for different tasks/workflows.
Krita looks quite nice, giving it a quick look, but like you said, it’s very obviously designed for painting and not design. Not all design can be done in vector format unfortunately!
Maybe I will get around to giving GIMP 3 a shot and trying to figure out how to use it. I want an open source replacement to the Adobe suite so, so badly. But I feel like I just can’t make the huge compromises required for that, yet.
To be fair, it was probably some hardware issue. I had endless problems with my old Nvidia GTX 580 which I would have been using at the time. And yeah, it was quite a while ago :P