I honestly think it's unfair to judge someone for not putting significant time into learning another complex program. I've used Photoshop since it first existed, and it's basically a lifetime of knowledge. A combination of things has brought me to exploring other open source solutions, but GIMP is definitely unintuitive in comparison. I'm only putting the time in because there's literally no alternative that's as powerful and ubiquitous an image editing solution, but I'd also be the first to jump on alternatives that would make the transition easier. It's especially not fair to cast that judgement on professionals who don't really have the time to invest in learning a new tool from scratch.