Teachers are a unique and wonderful group of people. They dedicate their lives to helping students reach their potential. We do a lot to identify how students learn (see Multiple Intelligences) but often times teachers forget that students do not want to hear how much they know about a subject. Most teachers are "Verbal" individuals. However, more and more students are "Visual" and "Kinesthetic".
The thought of hearing another lecture (albeit very passionate and informative) sounds like torture to these "V" and "K" students. It is great to see some of the heavily lectured AP courses becoming more project based.