This question implies that you have an idea (imagination) about how imaginative you should be.
A ‘person’ is someone who imagines. All cultures are wired to create stories and music. (narratives and emotions) If you relax into the story and let it take you in, it will and you will forget it’s not real, just like in hypnosis.
Some people are more visual than others, and it makes little difference.
We all feel emotions when we believe what we imagine. It’s not like you’ll be really seeing the movie as in a dream. Thoughts are invisible, sometimes we think we really saw something, sometimes we just get the sense, and sometimes we only feel the emotion and have no idea where it’s coming from. Sometimes the suggestions can be very clear, other times they may be vaguer. The music and sound effects also contribute to transporting you right into various scenes in the movie. In fact, the music is so powerfully crafted that your mind won’t be able to help but imagine and feel.