Yeah, i've experienced something simmilar. I think it has to do with a change in attitude concerning the experience. I innitially used to take it in a social setting, wich is realy great. I had the deepest discussions with people, and also a lot of fun. But when you do it in a dark place, on your own, it realy becomes a whole different kind of experience. When there is no conversation, no thought, no distraction, the experience can begin to 'flow' and take you to places you wouldn't have thought possible.