I tend to pursue new ideas quickly for a short time, then leave them unfinished (I have notes on at least three posts I intended to make here that are now stewing in post-purgatory). My first drafts of writing on the subjects tend to be meandering and disorganized.
If I actually want to finish writing something or appreciate the result, I need to plan it out. This usually makes it easier for me to fill in the bulk and much happier with the result.
Same here.
Although I also tend to find that my enjoyment of the writing process increases once I've got a certain amount of stuff out on the screen. So my writing process looks something like inspiration -> boredom/dislike for idea -> enjoyment and satisfaction at pulling information together into a coherent whole, and most of my ideas get stuck in that valley of boredom and dislike for the idea.
Steve Pavlina explains that the method he'd been taught in school-- a highly structured writing process of organizing what to say before it's written-- tends to produce dull writing, but starting from enthusiasm results in articles which are a pleasure to write and are apt to be more fun and memorable to read.
This looks like PJ Eby territory-- it's about the importance of pleasure as a motivator.