I don't think that GIMP should be the same, but it does have issues with usability. And when you search "how to do X in gimp", you'll probably find a 10 steps guide, while in PS that'd be a couple of clicks. There's no DDS plugin that supports all compression methods at all. There are so many things that won't go away no matter how many seconds or minutes or years you'll put into learning GIMP.