There's definitely 'mystic bullshit' in Vipassana, but it's not the 'vibrations' part (the Vipassana course emphasizes over and over again that the sensations you're supposed to watch for are real, physical sensations - pressure on the skin, temperature, sweat, itching - nothing mystical)

The positive effects (for most people) are also very real as well, in spite of the "mystic bullshit".

Why are vibrations associated with mystic bullshit? I've noticed this too, but I don't understand.