If only Linux had decent image editors... I would have made the jump years ago, but Gimp and Inkscape ain't just cutting it.
No wonder so many people are moving to Sketch.
http://doctormo.deviantart.com/art/Gimp-2-8-Photoshop-Tweaks...
http://lifehacker.com/how-to-make-the-gimp-work-more-like-ph...
(disclaimer: I write Filmulator)
3-4 years ago they seem to have changed (apparently to make things closer to photoshop, is my guess?), and now it seems like the UI sucks for everybody.
https://www.youtube.com/watch?v=JNoVb5k40sU&t=30
the guy (a pro photographer) explains how to make GIMP less ugly and more usable.