Mike,
I've done a bit of image streaming. The benefits are a little difficult to explain because I don't think you gain a specific skill instead you think clearer and more ideas flow to you. Some say our minds are restricted by our daily pressures. We force ourselves to focus only on solving specific tasks. Image Streaming trains us to remove those constraints. An analogy I would use is that in the city we see fewer stars then in the desert. The same amount of stars exist either way but, the city lights block our view of many of the stars.
I am a programmer and I find it helps me get through problems. With streaming I get an additional 5-10 ideas on solving different problems.
I could see it as beneficial for removing writer's block, helping with problem solving, producing ideas in any area.
This has been my experience.
Hope it sheds a little light...
Mark