Am I alone in thinking that this goes a little bit too far?
If you were to go through and answer all nine pages (!) of questions, perhaps, but as a tool for inspiration rather than rigorous, methodical, exhaustive description, I can see the utility of it.
As I was reading through the questionnaire, I was answering them in my head as they apply to a character I created last week. First, I was able to answer many of the questions, based on the sketchy background I scratched out earlier - this in itself was interesting to me, because while I didn't write down very much about the character, those fast, broad strokes allowed me to fill in the details as I was confronted by the questions, which is exactly how I do it in actual play, working from a general background down to specific actions and reactions.
Second, a couple of the questions opened up some doorways to my character that my broad outline neither addressed nor informed as readily as it did most of the others.
Together this let me know that while I had a good handle on my character for purposes of roleplay, there were some interesting personal paths for him to explore in the future as the character develops.
So, there's that.