As someone who uses it somewhat regularly… It’s terrible. Apparently the next update is supposed to fix some of the UX issues people have had for years. But they said that last time as well.

I just use Krita now for most stuff. The only thing GIMP does better (or did, I haven’t checked recently) is textboxes. Adding text to images on Krita was a nightmare a few years ago, but maybe they’ve fixed it.