I've found that for me, journaling makes me ruminate more and I often feel worse than if I just didn't think about how I feel. Maybe that's supposed to be part of the therapeutic process? Either way, I know I'm in the minority here about journaling. I just find it more therapeutic (usually) to write fiction. My characters are exaggerated facets of my personality.
And you make me laugh. Worried about not being G-rated? If I REALLY wrote about what I thought about, at LEAST half of it would be X-rated.

I'm not sure I'd like the idea of having a therapist read them though. Unless she were a sex therapist maybe.
All of that said, I did do some stream of conscious journaling on my own when I was working through The Artist's Way, but I just find it really hard to stick to. Might as well try it though.