It genuinely never ocurred to me that you use emacs somewhere outside the terminal.
Besides, it turns out, setting up emacslient for quick editing, or even for bringing up Dired to use as a directory lookup and switcher is also very nice.
- Image previews (for file management with dired/dirvish)
- PDF viewing
- In-buffer images (e.g. profile pictures in git log with Magit)
- Browsing simple HTML pages (e.g. API docs)
There's probably more I've yet to discover.
Using it on the terminal only over telnet when a remote X session wasn't possible.