Like DancingMaenid, this is a major struggle for me. Add to that I'm externally motivated—as someone pointed out in a previous thread—I don't really have the luxury of putting the story on the backburner. Deadlines have a way of attaching themselves to commitments and, having made a commitment, I'm locked in.
I’m a full-on pantser: no outline or cards, no planning at all, often no story idea, either. I may have a character, the MC. I type the first sentence, which almost never changes. (Can’t remember a story where it did, to tell the truth.) Each sentence follows one after the other, the story building as I type and read along. Somewhere after the mid-point, I begin to consciously think about the story and where it’s going or where it might be going. The characters stop in their tracks or start milling about waiting for stage direction. Okay, fine. You do this, you go there, and you over there say this. C’mon, move it! And that’s when the story begins to suck. Big time.
I write on until there’s an end. The last paragraph or those last few sentences are right and I know they are as they were supposed to be from that beginning sentence. But everything that precedes that last paragraph from the mid-point on where I started actively thinking about the story is unsatisfactory to me and I suspect that if I hadn’t begun to think about it, the organic story progression would have been smoother and more satisfactory—a better story without having had to edit and revise from the mid-point on. Just once, I'd like to know what that looks and feels like.
If I didn't love editing and revising so much, I couldn't write worth spit. (Probably can't anyway, but that's another topic.) I realize, though, that I'm an outlier in my love of revising. That deadline, though, is the ONLY thing that can pry the story from my constant tinkering.
I'm in awe of plotters, those who write out of sequence, and those who imagine a scene and write outward from there. You rock!