This film is a wonderfully heartwarming docu! Never knew it was so highly acclaimed, but I'm not surprised. I saw it a few months ago, and was very impressed. The other thing that didn't strike me as anything new, was precisely what you said: that you can develop a trusting relationship with an invertebrate. In fact, I'd say the same thing about any other creature, including the kelp. Though I'm sure you are very familiar with this, being so active in your garden. Not to ruin this wonderful feeling, but the most recent marine documentary I watched, knocked me completely into the corner, as it stands in a violent contrast to this one: It's called Seaspiracy, not sure if you've seen it.