I write creatively--I guess when anyone writes, it is creative. But I actively engage in creative writing where I have to imagine personalities and scenarios. My husband sometimes answers me, because I can get so involved in a story that I speak out loud.
My husband and I laugh when that happens. I'm not sure this talking aloud fits into any of your categories, but I have the feeling I'm not the only creative writer who does this.
A very interesting piece...I like the way you enumerate the benefits of talking out loud and that you clearly distinguish the pathological from the non-pathological--an awareness that no one else is in the room with you.