I looked at Beat Saber and lurked on some Reddit discussions about the game.
People say that it is successful because there is no “artificial motion” on the part of the user - ie, any movement the user experiences is the natural movement of their body and arms. This match between visual and proprioception helps to ground the user’s feeling of presence.
Moreover, there is a lot of negative space and a sparse set of 3D “Beats” that move towards the user at a constant, rhythmic pace, so this movement of environment in a specific direction against the player movement fools the body into feeling forward movement while matching the senses to the player’s actual physical movements.