You'd say, "I think you will enjoy the film," if you know the person is planning on seeing it in the future.

You'd say, "I think you would enjoy the film," if you don't know whether they have plans to see it or not; all you know is that they haven't seen it yet.

So the difference with *would* is that you're speaking hypothetically; there's an implied "if you saw it..." there. It refers to something that hasn't happened yet, but still could. So it's not really a statement about the future as what's expressed may or may not ever happen.

That said, in some cases *would* does refer to the future, though from the perspective of the past:

- *He tells me that I will like the film. &gt; He told me that I would like the film.*