Hmm for me when I sit down to think of a story, or new material within an existing story, I usually can plot out the broad strokes pretty effortlessly/intuitively. Like the bullet point portion of an outline with the major events in order.
But fleshing out and connecting those bullet points always requires a large amount of focused, concious effort. Like when I'm in a writing phase I'll try to use some of my idle brain time to mull over the story in my head, and i can resolve some things that way, but it would take forever to finish. I get a lot more done when i park myself in front of my computer and am like "time to write!"