It's about the only thing that fills the void remaining after a major project is finished. I can't speak for other authors, but every time I finish I get a little mopey. Yeah I have other projects to stick in there, but I have the malaise getting in they way.
It's that feeling when you know you have other work, but have no desire to tackle it yet. It's not procrastination, rather it's the argument I have with myself:
ME: "I just wrote, edited, scanned, skimmed, rewrote, revised, buggered with imagery, slapped it all together and PUBLISHED! Yay me!"
MYSELF: "...now what?"
"What's next? Good for you, by the way, but what're going to do now?"
"Take a break. Relax, and try getting some sales."
"Get back on that confuser and get the next project done. You've a blog to update, eBook conversions, a writing partner with writer's block to help..."
"I'm being realistic."
I: "Shut it you two, Supernatural's on."
Thus I slip into a state of dull ambivalence until the gumption to do something wordy comes back. It's not like I'm going to wait another four years to finally put out another book. I want to enjoy the afterglow a bit and see what evil just made Dean Winchester its bitch.