I've only ever rolled with real dice. Rolling will real dice on my table rather than using roll20's dice roller acts as my DM screen (in a weird sense). I was trained by a DM (who has been playing DnD since before most of us were born) who highly recommended rolling dice that way! (It also keeps the roll20 chat less cluttered which I like)
One of the elements of game design that I like is the concept of "the less you know or see it, the more frightening it is" So in that sense having rolls being mostly unseen can add an additional sense of mystery and fear!
I'm horribly horribly terrified of cameras. It was honestly my greatest concern when JP approached me. I can do stage performances and voice performances but when a camera is involved and there's no buffer (IE a costume or mask) I get really uncomfortable and tend to shut down due to being overwhelmed by the presence of an un-blinking omniscient eye.
I've seen quite a few people discontented with my lack of camera, but I assure you, had I been on camera, I would have been so off-kilter the one-off would have been much less enjoyable! This is why I try to make up for it in vivid descriptions and fun voices.