Alt-tabbing (or cmd-Q if you’re done) back to your terminal window after running `subl` to edit a file is equivalent difficulty (as measured by keystrokes) to exiting nano or vim.

I've been using iterm for years mainly because it has a Quake style terminal window. I realise how I just can't get to grips with tabbing through screens on either macos and windows anymore, not with having multiple browser profiles (personal and work) and screens open. I should figure out a solution to that, but at the same time I decided that I should keep my various employers (I'm a contractor/consultant/temp/whatever) separated better, so, different browser profiles, password databases, etc.

Isn't that kind of where macOS features like Exposé and Mission Control come in handy?

I'm on Linux and I just use one keystroke to switch (F2). I have F1 F2 F3 F4 keys binded to change to virtual desktops 1 2 3 4. 1 -> Console(s) 2 -> Editor (sublime) 3 -> Browser (Firefox) 4 -> Misc (File browser, other apps)