I'm also sticking with Sublime for many years, and at this point it feels like it is some kind of old man stubbornness (like George R.R. Martin using WordStar 4.0 type thing). I don't know why its ergonomics for me have been just unbeatable. I gave others (VSCode and Zed) good weeks and months of configuring them to my liking and using them exlusively, and always returned to Sublime. All the AI stuff just runs on the side in the terminal (iTerm2 for me, but checking in on Ghostty sometimes too, waiting on them to figure out their minimal text brightness feature).

As you mentioned iTerm, you should also check out TextMate, the thing that Sublime Text was inspired by.