Heh, I actually mapped my thoughts following Lion Kimbro's method, six or seven years ago; I still have the notebooks on my shelf. From what he later said, he doesn't really recommend it, it bogs one down.
I still think it was an interesting experiment, though I'd put it more in the category of creativity helper / mind map; it's also interesting to have a snapshot of the kind of stuff I thought about a lot at the time, with quite a bit of detail.
Related to: Living Luminously
Well? Should you?
Linked is a treatise on exactly this concept. If the effects of recording and classifying every thought pan out like the author says they'll pan out... well, read a (limited) excerpt (from the Introduction), and I'll let you decide whether it's worth your time.
The full text is written in a stream-of-consciousness style, which is why I hesitated to post this topic in the first place. But there are probably note-taking junkies, or luminosity junkies, or otherwise interested folk amongst LW. So why not?
(Incidentally I'm reminded of Buckminster Fuller's Dymaxion Chronofile. I wonder how he managed it, or what benefits/costs it wrought?)