Great question, Piko.
Here are three major reasons:
1. Even with widespread use of mind mapping in business, most students have never heard of mind mapping.
2. Once they hear about mind mapping, they don't know how to apply it to school (no systematic method). Note: this has changed now with publication of Concise Learning book (also available as an iBook :ipad-front.
3. The paper & pen note taking habit is hard to break because students have been trained to copy notes throughout their school years. With mind mapping, students can transition from copying notes to thinking during lectures, a big change that requires a major habit change.
1. Widespread? I wish it were. I've been working professionally since 1985 in the IT industry and have NEVER seen anyone doing anything remotely like this. I've worked with 100's of engineering professionals and everyone I've ever known kept it lineal. I've even attended brainstorming classes (a perfect outlet) and not a peep.
2. Yeah, it's a travesty that when I went to school, I was never taught how to study. Would have been nice to have at least had Concise Learning around (although it appears to be a new book as of this year).
3. Excellent point here. In fact I've been pinging many middle level managers on this very topic in relation to their employees and their abilities to complete tasks and projects. The end result is, they have all asked me to prepare a course to conduct in their office to teach the basics of mind mapping and how to apply this technique to their daily lives.
And what, do you suppose am I using to develop the course? Why, mind mapping, of course, and on the iPad no less.