Similar story here. I often liken it to a musician with their instrument, or a master blacksmith with their hammer - at some point the tool stops being a separate entity and becomes an extension of the person wielding it. I think the ability to have this comes from the fact the fundamentals of the tool are stable across decades.
Moved to neovim because it felt faster than vim 7.x and it was fresh and exciting (couldn't believe the progress the project was making in a short period of time, compared with vim). Then I stayed because of the native LSP support and nvim-metals (among others).
Things work, to the point that I'm not really using the editor but editing (if that makes sense). It is completely invisible to me. It is my editor.