You don't learn the material from the socratic method.
I'm convinced that the sole purpose of it is to teach you how to organize and speak your thoughts. One of my profs loves to pick on people that have a tendency to speak before they think. If he calls on someone, and their answers are well thought out, they are familiar with the important facts of the case, and are able to answer questions in a way that shows they have at least a basic understanding of the concepts presented in the case, quickly moves on to someone else. He moves on until he can ream someone for 20 minutes, pointing out poor logic, befuddled use of language, and other problems. It can be harsh, but you can learn a lot from it. Unfortunately, most people get mad about it, or refuse to learn anything from it.
It's useful to learn how to shape your analysis and phrase your answers. Yes, we'll get more formal training on this when we have to present oral arguments. But every bit counts, and I do think that with the right professor it can be incredibly useful.