osprey, great points.
It does take quantity to get good results, and quantity takes time, and who likes to take time writing!
The one thing I have noticed about paper and pen, is that I have found that in a lot of cases, it actually discourages anglers from continuing, because they don’t see anything tangible from what they are writing. Frankly, doing data analysis against a stack of paper is pretty much impossible.
With the really good computerized logs, there is at least some level of instant gratification, seeing your statistics numbers as soon as you enter, having a lot stuff auto calculated for you like moon phases and weights, etc. (and with quantity, the gratification while not instant is a lot more intense when the patterns start showing up). Also, the good logs do make data entry as easy as possible with drop down fields and the like.
I also like to always make this point: The fact that entering a log (no matter what kind) takes time, is actually a good thing. It forces your brain to think about what you did on that fishing trip on a different, almost subconcious level, making you learn things that weren’t apparent when you were in the act of fishing.