Psychedelics have helped me move past a few dark period of my life.
I, however, do them for the light.
Nothing in my life has ever compared to a real psychedelic induced samadhi experience...and quite frankly I don't think many people have really experienced it. I know a lot of people see the light and play with it, but it's not the same as a full immersion...but I won't go down this path because I don't really know what any other person has experienced. 
I do know this. One of the light experiences lasted 20+ minutes and when I came out of it I was face down in prayer position on the other side of the room completely enraptured with joy and devotion to all of creation. I have no idea how I ended up on the side of the room. I also know that the after glow lasted for 5 full day's. The next morning I almost cried driving into a beautiful sunrise.
Hands down. I'll take the light every time.
However, I had a period a few years back were I was having a lot of anger/depression problems and I couldn't seem to let go of my anger...in fact the more I tried the more it latched onto me. I used shrooms to confront it directly on a few occasion. Two of those experiences were down right terrifying, but at the end of the day I have to give credit were credit is due. Those experiences helped me to clear the mental blockages and move past them. But they didn't do it alone. They cleared the blockage and then I still had to do real meditation work to move past it.
Today, I don't have many deep issues and my psych usage is limited to a few times a year (maybe 8-10 at most) and when I do them I do them as part of a meditation ritual..and I hands down seek the light.
Oh and I have no problem calling it the "God light". Once you have REALLY merged with it...lost full contact with body, ego, and anything you...felt your conscious mind stretch to infinity to dance with galaxies millions of light years away... once that has been experienced there is no problem referring to it as the god head.
One last point. All of my real godhead experiences have been on relatively small doses. under 3gramns of cubensis shrooms. I use kriya pranayama and meditation to reach the light. I've never once done this without pranayama and meditation. I have seen the light without them, but only with meditation have I become the light....in the truest sense of the word true.
In fact I'm pretty comfortable saying this...even though I know it will bring a back lash from many on the nexus. That light. That light is God. Everything starts and ends with that light. I have no proof...nor do I seek any.
Peace