I know it’s not really useful for programming, but for documentation and some of the free writing exercises that I do when brainstorming features or writing an article it would be great. I use a Markdown editor for that, so it would be one less editor.
All that said, I just got in, just downloaded it, just started it, so maybe my first exercise will be extending it to show a word count in plain text and markdown files. The extensibility is one of the key features, no?