[d3Xt3r]

Since you've got Photoshop muscle memory but you're no longer a heavy user, have you considered Photopea[1]? It's very similar to PS in terms of UI, and even has the same keyboard shortcuts, so you'll feel right at home. At least more "at home" compared to Pixelmator, IMO.

[1] https://www.photopea.com/

[geenat]

Photopea is only good for smaller edits/files otherwise it starts lagging like crazy.

That said, Affinity is quite fair fast even on huge files. You can bring over like 80% of your Photoshop muscle memory.

Honorable mentions depending on your needs: Figma, Penpot, Krita

[maxwellito]

I'm still amazed about the quality and responsiveness of this web tool compared to the real Photoshop. Just starting Photoshop CC is longer than opening Photopea + a quick edit + export.