I think the one potential good of drugs is that you can look at things from a new way. But they're really not worth it for that. You can look at things from a new way without drugs. I notice good musicians always seem to take drugs. I think that's more because they end up desperately suicidal and turn to music then to try to feel better. And they are trying to assimilate also. It seems that a lot of artist types are really concerned with trying to fit in/be cool or whatever. Which seems really strange to me. But I remember I always got dissed because I was getting degrees in engineering and didn't dress right for them. I was stereotyped and dismissed.
I went to art school for a while, and I found the opposite to be true. Most of them would try harder to be shocking and/or unique than to fit in and be 'cool'. For most artists/musicians, the drugs had nothing to do with being depressed or suicidal, more as a quick way to try and tap into their subconscious and expand their creativity.