Personally, I'm very much against the idea of writing down "whatever horrible shit comes out of you." Maybe it's me personally. I think it's faster to actually outline, revise, develop, revise, etc. in a much more cyclical manner. Planning can break the looming threat of writer's block. Quite often, I won't have enough ideas to start to get anywhere in a worthwhile manner.

Instead, I want to flesh out the major ideas and develop them as much as I can along the entirety of your work. Write out parts here and there to determine what the direction of the development is.

Ideas are comparatively cheap. It's the development and details of ideas that can be difficult. So you need to give yourself room to make those developments.