Thank you everyone. Jason: The article you referenced was particularly helpful.
I apparently have a habit... and I suspect it's a bad habit... of getting lazy when I feel like I don't have much to do. The more I have to do, the more productive I seem willing to be (or actually am). With just 3-5 projects on my list, I seem to have the belief that there's "plenty of time" and thus no need to rush. So as I said... I get lazy, and not much gets done.
I know there's a limit to how many business projects I can have going at once, because there's a limit to the number of hours I'm willing to exchange for a set amount of dollars. But by not listing my personal projects alongside, a lull in business made me very unproductive all around.
With the help here, I've already started turning this around and getting back on track