Say
I never have a clue what I'm going to say, or how I'm going to say it. I don't even know what will happen on the next page until the page I'm writing is finished. This is the way I prefer it.
But I hate the term "organic." It implies some sort of stream of consciousness, write whatever comes to mind style, and this is not how it works for me. The story structure itself dictates what I write, and as long as the structure is sound, one event leads naturally to the next without any need of planning or plotting. This means that if I know how to write a good, well-structured opening, the rest of the story develops on its own.
I don't plot, I tell a story, and if you tell a story, a real, well-structured story, plot comes along as a byproduct.
But it is not organic, it is not aimless, and it is not inefficient. It's the most efficient form of writing there is, in my opinion, which is why so many prolific writers use it.
I think the mistake many new writers make is in think that you have a choice of outlining, or of "organic" writing, with "organic" being defined as "I still have to plot the thing, but I'll do it as I go."
What I do is better termed "Situational writing." I don't plot, ever; not beforehand, and not as I go along. The situation does the plotting for me, and doesn't need my help to get it right.