Hi, from what I gather it is usually higher dosages that produce all the cosmic insights and the quitting of addictions. Usually happens with naturally grown mushrooms or dmt, preferably from the back of a frog!
Trips do make you not scared of death because it shows you that you are not your body, that you can float away into other dimensions and meet other beings. So trips prove to you with first hand experience that after your body dies, you will carry on. Our body is just a space suit that comes in many colours and shapes :-)