It's really a matter of personal preference, but many of us experience changes in personal preference over the years. Sounds like either this is something that happened to you or you just weren't ready to experience something different until now, which is also something that is a result of the maturity that we gain as we get older.
I've seen Phish quite a few times, but that was all in my younger years. I recently "re-found" them and now I'm dying to see another show. Hoping they play somewhere relatively close by in the next year or so. Would love to see them again and have my wife with me to experience it!