For me I kinda have to power through a new idea to something I consider "completion", or I won't come back to it. That's tough because pretty much any time I call up any patch of any kind, I can come up with an idea for a song. But even if I jot that idea down in a new file just to capture it, odds are I won't go back and revisit it later. I have to get sucked into "the moment" of a song and see it through almost non-stop.
Recently I've decided to go through and really organize my Refills/Sound libraries collection. I'm happy with the direction it's taking, but as I audition each refill to get a sense of what's in it, I'm coming up with a zillion little ideas. Blessing and curse rolled into one! LOL