What I did not make clear when I listed that feature set is that some of these things that have kept me on PS are advanced features that I'm pretty sure aren't available in the GIMP.
Can the GIMP finally do all that?
Give it a try - I haven’t had a need for anything other than Gimp since I switched.
I said the same about Open Office. Tried it about 8 years ago - haven’t looked back.
If there’s one or two features - see what you can do to find a free alternative to those advanced features. There’s a few things I can’t do (Natively), with open office that I can do with a MS product. They crop up once in a blue moon, and I have to figure out a workaround. It’s usually not too difficult.