I found Inkscape when I needed to make some diagrams, and even though that’s not really what it’s for, it blows dedicated diagram tools out of the water.
Inkscape is actually fun to use because it strikes a nice balance between easy and powerful.
My only problem with GIMP lately has been that by default it’s used monochrome tool icons which are really hard to tell apart. Which seems like a real form-over-function decision (likely made by the distribution though).
I could change it in the settings. I just hadn’t used it in a long time and it took me a bit to realize that this default was why I suddenly had trouble telling the tools apart.
But if the differences are that big I’m probably still on 2. Looking forward to seeing what 3 will bring then :)