I've used photoshop, its UX wasn't nearly as bad. Me as a user had a pretty good experience with photoshop, but a really bad experience with gimp. Hence gimp has bad UX and photoshop has ok UX, according to me and most people I've seen. People trying to convince me and the other people that our experience wasn't all that bad with Gimp is the problem here, that attitude ensures Gimp will always have bad user experience.