Take about anything from a standard GUI editor. In a terminal editor, they are also easily accessible. And more easily accessible (if not discoverable). But one of the major gain is how close your shell is. A lot of editors allows to start a cli tool and optionally send a portion of the current buffer as input to it. You may also be able to include the output in some buffer too. Some GUI editors allows that, but it's almost always a config maze and you're never sure of the environment in which it does run the commands.

Also in a terminal environment, all you enter are keyboard keys. If you know how to touch-type, your cognitive load can be greatly reduced (personal feeling). You can also navigate something like sublime with keyboard only. But it's way more tiresome.