I think we all have this destructive and lazy side to us. The worst part is the guilt you feel afterwards (towards others if you let them down, or to yourself if you pass up an opportunity.)
The fact is -- the most successful people in the world can always find the time. To be 'too busy' is, in my experience, a sign of bad organization, a sign of laziness, a lack of professionalism and a lack of self-discipline.
I have been that guy many, many times. One of my favorite writer/directors agreed to do an interview for this blog. I stalled on setting up the call for six months. That's not cool. I can't be doing that anymore. When we complain about how our careers aren't going right, or how we're not getting the right opportunities, we rarely mention that "oh, yeah, a Producer is interested in hiring me for a big project and said I should call him - but I haven't and fourteen months have gone by."
I think it's about discipline. I now make myself sit down and read, I make myself do paperwork, I make myself do whatever it is I need to do to get the things I am doing done (wow that was a mouthful).
"Decisions are made by those who show up."