Have been doing editing for way too long, but as a part of my engineering job, not as a fulltime graphics person, I can say that PaintShop Pro is a lot easier to learn if you aren't using it fulltime. Any editor takes time to learn, and if you only spend a few hours a month, PShop is a booger to learn.
Add the fact that PSP tends (when I researched it it) to be more full-featured than the stripped down versions of PShop (CE, Elements, etc) and about the same $$ as the de-featured PShops. Of course, for fulltimers, the defacto standard is PShop without a doubt; but that can run $800 and up. But even fulltime PShop'rs are surprised at the power that PSP has (layers, etc).
My brother did a lot of PShop as an architech and was quite taken aback when I showed him all the features he thought were exclusive to PShop, quite handy and all right there in a $50 editor. (PSP tends to get discounted more often than PS)
Of course, the bottom line is that an editor is like any other tool: it works best with a lot of practice and familiarity.