Certainly, when I learned Transcendental Meditation back in 1989 it was a life-changing experience, though I gradually moved away from the more cultish aspects of TM. Perhaps anyway, as the Dalai Lama put it, "sleep is the best meditation".
I learned Transcendental Meditation (TM) through a formal course in 1989. I don't entirely buy the claim that just a few minutes' daily meditation can make a difference between an anxious existence and a life of quiet contentment...but it helped. TM opened inner portals that, happily, have never closed.