I'd argue that this one (from your link) is patently wrong:
"6. Batch processing through automated actions is far superior in GIMP. Because photographers often need to do repeatable actions to large groups of images, this feature alone is worth its weight in gold."
I am a photographer and although I use LightRoom heavily, I use the batch rules in PS for my concert work, I can get very detailed with little trouble in PS. I did try to switch to gimp (or more accurately, tried it out) and found this to be sorely lacking. Not to mention the batch actions in PS merge/link nicely with the plug-ins (specifically the Nik software for B/W work) so if I wanted to, and on occasion I have, I can do some *serious* transformations on a shot in PS with one click of a button.