Doing meditation is one of the transformative practices I do. Secular mindfulness meditation specifically. I've heard that people have success with many other forms of meditation too.
For me it's not so much about "reducing stress" and more about remembering the inner 'truth' of my being. The ego is a tool, a product of my mind which I can use for good or bad. Remembering that we are the consciousness behind the ego (and not the ego itself) is really important for me. Meditating is one way of remembering that truth on a deep level...and living in the present moment is a wonderful practice to adopt.
Meditation brings raised consciousness and with this raised consciousness comes MANY things, including the possibility of change. With little to no consciousness in each moment, it is impossible to notice what we would like to change about ourselves and in what way. As somebody who practises self-change, it is important for me to have high consciousness for what it is I'm doing and how it is I'm changing and would like to change.