For me, it was just that I have been using Photoshop for years, and GIMP for 3 times max. I took the time once, and clicked through all of the menus, and settin

For me, it was just that I have been using Photoshop for years, and GIMP for 3 times max. I took the time once, and clicked through all of the menus, and settings, taking at least some seconds to read what they do. I think it took around two hours. After that, working with was much smoother. And now, when I sit back to Photoshop, I appreciate the adjustment layers and text effects, but I'm similarly confused about the UI as I was back then with GIMP. It really is just a matter of familiarity.