Hi,
In the past, I have used, for example, a couple of screenplay writing programs, because the format of those things is (sometimes) important, and makes it easier for folks to read in the business.
It never sold me anything.
All in all, I like those programs, but for me, writing, is an intuitive art, and if the words are there, they are there, and if not ... then they aren't!
I am a VISUAL person, thus a word, on top of a note doesn't mean anything ... the note has to speak on its own by the way it is played ... and is the reason why I say that the music has to speakl, not the notes or chords!
(Ex: play it with hate, and it sounds different, than playing it softly and with love! ... thus, a song's words would make it different. And likewise, the music flow would tell a different story as well!)