Writer Duet, Scrivener, Final Draft uses it.
These are popular for Writers- Hobbyists and professionals (novelists-scriptwriters, etc)
I understand the perspective- just a recommendation as it doesn't intterupt with flow/focus. I just find it frustrating to have to hit enter several times to get the text centered so I can see what I'm actually writing, just to do it over and over to write my entries.
Then again, I don't know what a casual user would be like, I write everyday for personal and work-