I do see the action like a film, camera positions and all, but with some very odd editing--and that's where writing style enters into the picture, because the writing can only focus on one thing at a time. while film can show it to you all at once. Dialogue, action, description, character thoughts. Lots of choices. Some writers lean more towards lots of description in their work, and that would be like a slow lingering look at the world around the character. Others focus on the characters thoughts, and then you're being shown the world inside the characters' heads, instead of the physical world. Or it can be a mix. In a book, the camera is always moving. The perspective can change, the time can lapse, we can fast-forward across days or focus in on slow-motion details. There can be telling, as well as showing. But yes, it's not clear-cut--it can be very vague impressions sometimes, and always subject to change. Rarely detailed. It's more like a dream-world than anything else. If something occurs to you, whatever it is, reality easily adapts. You could imagine a character sitting down, but if the next paragraph describes them standing and pouring wine, your mind edits that in without a problem.
As far as "hearing" sound effects and voices, yes and no. It's much like the mind's eye--seeing without seeing--only the mind's ear--hearing without hearing. You can hear how the characters would say something. You can imagine experiencing the relevant sound effects as you read that they happen--the whistle of an arrow, the cry of a crow. But again, it's vague enough that you can change it in your mind any way you want, depending on context and the next words you read. It can be like a movie in your mind, but you're not passively receiving this movie, you're actively constructing it, tweaking it, changing it, based on what you read--and it keeps its form even after you've read the words. The reader has so much creative control over this movie.
It's part of why I like the experience of reading audiobooks aloud. You're focusing on and connecting to those undefined sights and sounds you're imagining, and translating it out into emotion, speech, and real sound. You're taking the voice you hear in your own head and trying to be that for another person. It's why listening to an audiobook will never be the same kind of experience as reading. And watching a movie will never be the same kind of experience as reading a book. Imagination plays such a large part--and it's the individual kind of creative, interpretive control you have over your imagination that will determine what your experience is like. One thing I promise you, it will never be like anyone else's. There's no single way you SHOULD experience a book, so as long as you enjoy it (and aren't experiencing any problems with understanding it!), I really wouldn't worry about it a bit.
. As someone wiser than me has stated (for a much more serious subject): a person who tells you what to think is not your friend. 
