@vampiress It's a very specific thing and doesn't exactly answer your question, but there's an experience that was seared in my mind. Though I usually don't pay much attention to these things, I found that a certain sequence in What Remains Of Edith Finch - the fish cannery one, for those who have played it - was an absolute masterclass in using the UI to help with immersion.

I don't want to spoil anything, but this sequence tells the story of a man who daydreams progressively more and more until he fully dissociates. And the sequence has your hands on keyboard and mouse performing certain tasks, representing the real world, while your eyes and ears are engaging with the story, which happens more and more in the daydream, until you cannot even see what your hands are doing anymore, and it leads you to experience a kind of dissociation. It is profoundly disturbing (which is the point) and absolutely stellar storytelling.