Watching movies and TV is not without value, but these are passive activities that take a lot of time. There are better options.

it can help you in any language

In my opinion , the need is the key point to learn any language. for instance , children they learn the perfect language to fulfill their need like food, going to bathroom and so on . as you need the language to learn or read certain thing you will be forced to learn the language .

listening much will enhance your pronunciation, even if you don't understand every word now, t's beneficial to hear the correct sound now and then you will recall it when you read it or learn it. so watching tv and movies is so useful, I improved my English in high school by music, listening to songs and read their lyrics, it's fun and useful too