I wish somebody could implement a Photoshop UI for GIMP. I am using GIMP as my main photo editor but there is a lot of UI pain. A lot of it. Many things are counterintuitive.
I vaguely remember a fork that at least turned it into a more traditional modal app instead of dozen small windows floating on the desktop. That certainly helped.
It has had a single window mode since Gimp 2.8 was released in 2002. Unfortunately it's not the upstream default, but a lot of Linux distros set it that way anyway.
Edit: Aha! Found it. https://en.wikipedia.org/wiki/GIMPshop Abandoned in 2007 though.