They soak up everything that they hear or see and then process it and can be taught how to use it. I am one of those people who tend to learn best in steps and have to be shown or told many things before I understand them whether I have applied them in a certain situation or not. The Case for Constructivist Classrooms, they acknowledge that the current curriculum is soo big and too broad to be covered solely as inquiry and focusing on individual interests. I feel that this is a type of teaching that should be incorporated, but not to replace all other methods. As much as we like to speak against it, there is a time and place even for pure lecture.
Constructivism is a great idea and it's a great way to teach.
However, I too do not feel that a completely constructivist class is very practical. Not that it would not be worth it professionally and for the students, but that it is a lot to do, specially for a new teacher.