One thing I can say I think benefits me quite a bit is that I'm never short on ideas. On the average, I'd say I get one new screenplay idea per every time of the day I light up a cigarette. And I smoke about a pack a day.
Okay, that's an exaggeration, but you get the idea.
That having been said, it's also a bit of a hindrance. I get so many ideas that I could be smack in the middle of writing one down when suddenly, I have to divert myself and jot down that idea as well. Now, imagine that diversion process happening every five minutes and you'll see why it's a hindrance.
So, I have a list saved on my PC. Right now it's about forty items long. Each item is a title and a really crappy log line, just enough to refresh my memory when I look at it. So, when I finish a screenplay and am ready to start another, I look at that list and glom over it, just looking for one of my past ideas to grab me. Sometimes, it actually works. Usually, however, I just close my eyes and touch my computer screen and whatever title and crappy log line my finger lands on, that's the one I start next.
This, in turn, results in endless hours staring at a blank computer screen, wondering where to start. Sometimes it hits me really quickly and I bang out a disgustingly high number of pages. Other times, it results in either falling asleep at my PC and missing dinner, or I get bored, shut off the PC and walk away (naturally, five minutes later, I get an idea how to start the script but by then I'm bored and tired lol).
Now, when I do settle on something I want to write, I'll kind of wing it as I go but have a general idea of the inciting incident, various plot points and my main protagonist and antagonist. I measure out the beats...inciting incident, plot points, mid-point, climax, resolution, etc. and then fill in the spaces for a very sloppy and hectic rough draft. Then I put it away for a few days. When I come back to it, I read it start to finish two or three times and see exactly what kind of damage I've done to the basic idea. And thus begins the rewriting process...which I won't go into, because this post is already taking on novella proportions due to my inherent tendency to ramble.
If I'm into a script enough to begin a third rewrite, chances are that puppy's going to go on to a final draft and will be registered with the WGAw. If by the second draft I'm just no feeling it...I back burner it and it collects dust in my PC's memory banks.
Just so you know, I wouldn't recommend anybody try my "process" if you ever want to finish anything lol