I always wonder if all of these "bad UI" complaints translate to "it isn't exactly like Photoshop". I only use the basics in Gimp myself, and I know it has a few quirks that I find easy to work around. I wonder if Photoshop has a pile of quirks that its users are used to find find weird when they aren't there and a different sent of quirks are.
The Photoshop thing, on the other hand, on the rare occasions I am forced to venture there, strikes me as a confusing mess that I'm always happy to leave behind as soon as possible. Plus of course it requires one kind or another of strange proprietary OS in order to function.