I used WPS, it was worse than Libre from the usability, plus quite bloated with all sorts of stuff (luckily, I don’t have to pay for the Office, and will never actually do that willingly). Haven’t used the other two, however, will have a look, thanks!
Both GIMP and Krita are very nice and decent, just not powerful enough for many things I need photoshop for. Inkscape is actually much closer to Illustrator (not as powerful, but still), so that might be the only one with the “getting used to it” issue.
Actually, one other thing I should have mentioned, is that I also transited from using Premiere Pro to Kdenlive (and sometimes even Blender for very light video editing). Kdenlive is an amazing success story for KDE, hope that happens to Krita as well.
PS. The name GIMP sounds amazing! Love it, they should never change it )