"Many language learners who first hear of this method think it’s simply too fun to actually work. In reality, it’s very powerful. When using the listen and repeat method, you’re learning a practical side of both grammar and pronunciation."

This, so much this. 

When I was a kid I would do this with videogames and movies, on a more obsessive-compulsive behavior I must admit, I would repeat a phrase until I said it exactly like the person on the TV, I did not know I was learning and had only realized about my English proficiency level when other people started asking me "where did you learn English?"; The answer was "playing Nintendo and watching movies (plus some self-studying on the side)"