I don't think it's a mythMaybe it's a place to store what may seem inconsequential at the time, but at some point something within that box may become of importance or the stimulus for something greater.
Oh it is. The waffles v. spaghetti system is a poor metaphorical depiction of male and female thought processes. I will design my own system, post it to my blog, and link to a thread on here sometime in the next year.
Speaking for myself, I know I don't have a nothing box because I'm always thinking about something. Then again I have some weird LD, so it might have trashed my ability to fit into a cozy gender stereotype.