Except when forced to do otherwise, I use Highland or Highland 2 to write screenplays. Recently, I’ve been using it for rough drafts of all documents because it’s fast and doesn’t have as many bells or whistles as, say, MS Word. I’m not sure I like it, though. It works for screenplays because you what you see in the document is more or less what you’ll see on the page.
Visualizing my writing on the page helps me imagine the reader, which helps me make small adjustments to clarify whatever I’m trying to get across. Articles and stories, however, look very different in the Editor than they do in the Preview.
Not being able to see the page makes me write faster, but less coherently. At some point in the writing process, I switch over to whatever word processor I’ll use to make the final adjustments. Lately, I’ve been making the switch sooner.