Also in addition to other sibling comments--note that OT mentioned having been using GIMP for 20 years and still being unable to figure out anything new aside from the tutorials he studied. So being "used to" GIMP is evidently (although currently sample size 1) not enough for it to be "easy to use".

Edit. I'm not saying Photoshop is easier to use--it might be just as difficult but with better resources available people might be able to learn it better.