I have both gimp and Photoshop and for the grand majority of things that I need to do minor photo editing, gimp is my preferred choice.

Sure, the interface is simplistic, but it works really well once you learn how to make it work, at least for my specific needs.

I will follow that up by saying that I am not a graphic designer and nothing that I make is published to the public, but despite that I actually enjoy using gimp.