This writer,
David Bergland, has a
series of blog posts about using InDesign for all writing (beyond simple note keeping).
I have several programs for writing. I have moved to magazine editing, blog posting, and seminary curriculum development in
Scrivener. If I had to use only one program overall, a solid, powerful, reliable writing tool, it would be
Mellel (secondarily Nisus Writer Pro). There is nothing better for handling Hebrew properly (it should, the developers are from Israel).
But I also have Adobe CS 4. I had it originally to examine copies of the magazine in InDesign. But after reading what he says, I may move to InDesign for those items that I want to publish (print, PDF, epub, etc.). I use Pages for bulletins for Sunday worship.
I had Word 5 back in 1990, when it was a decent program. I became an expert on it. But went MS-free six years ago. Because of exchange issues I recently bought MS Office (for $99), but seldom use it. It is far more frustrating than any of the above programs.