What kind of things does it make you think about? Like, would you say you've learned things relevant to your life today (examples possible?), or you just thought of some really weird fucking things due to being messed up? I just don't even know what to expect.
you think about life in general, your existence, why you exist...it kind of depends on the setting you do them in though, and how much you do. If you take 1.5g and walk around outside, you'll most likely just be amazed at nature, and the world around us, and you'll laugh at how everyone is running around in a rush trying to maintain their busy schedules, missing out on such beauty. It helps you appreciate the simple things.
Also, if you take some and just watch a movie, you'll disect the movie and try to figure out the greater meaning. For example, i watched district 9 the first time i took some, and was relating it to slavery and the civil war, haha.
I think the more you do (say 2.5+) the more internal your thought process gets. You won't want to talk as much as you'll want to just ponder. Some thoughts about existence and everything can lead to some pretty dark thinking, but you just have to be strong-minded and remember that you're just on shrooms...which is fairly easy to do, in my opinion.