DJing is a personal thing, so whatever works for you, shoot for it. Personally, I never like to write anything down or memorize any numbers...even after Nemesis and Montie and everybody else taught me a whole new aspect of DJing(harmonics, keys etc...), I never bothered writing the keys down or BPMs. I try and have the most clear cut, pure connection with the music based on it's sound and mood, so I can mix with emotion rather than numbers. Sounds kinda cheeky, but it's made me about 4728974x better than I was before, not to mention beatmatching and other "technical" skills are like 2nd nature.
Even though your method is really deep in terms of the intro.outro thing, BPMs and keys, always remember that those are just that: numbers. Mixing is about what YOU need to do to get the feel YOU want. Granted, like Nemesis said, DJing requires a bit of musical theory and quantitative approaches(i.e keys and the feel of a mix can be dicated by a scale of numbers, some argue.), the most important thing not to forget or let go is your own interpretation of your music.
Hope this helps. I don't mean to sound like a fucking motivational speaker, but I find that people who aren't"tainted" buy the commercial and mass appeal aspect of music are the ones who stick with the basics and nothing more...something that I advocate in every aspect of whatever I do.