If you think with a cold head about it, do you believe the frustration came from the fact that Gimp has made actually bad choices about placement and design of its features? (tools, menus, options, etc...)
Or would you say it's just that they took a different path, not worse nor better, just wholly different, and that makes things more confusing for people who are used to, and have the different thing made by Photoshop, ingrained in their minds?
(btw your mention about Krita was very spot-on, because otherwise conversation usually ends up revolving about how Gimp is FOSS and thus they cannot afford having a full time designer working on the best possible UI... but in this case it seems clear that Krita has been better for you, while also being FOSS)