Does your perception of reality change after you project?
Do you get new senses? Could you please describe them?
It depends on the content of the experience you have. Most of my experiences are non-profound, but they do lead to subtle alterations of perception of reality in a general sense. For example you may experience what it is like to have no fear or shame, and that mindset can carry through to a limited extent, atleast due to the sheer fact that you are aware that such a state of mind exists.
I think everyone dreams of having a profound astral experience where they learn the secrets of the universe; and upon returning they can project at will and see auras and predict the future and so on. I think this really can happen for some people, but it hasn't been my experience...yet.