This is a conversation I have often with my friends, and I usually tend to be in the minority, but I hate going into shows blind. Every show in recent memory that I've seen going in blind I truly have not enjoyed as much as ones where I'm prepared. When I'm seeing a show blind, I spend so much time analyzing the story and trying to understand the lyrics and plot, and I form split-second opinions that taint my experience.
For example: I loathed Mean Girls when I saw it in previews. I hated the music and the storytelling. However, now that I'm extremely familiar with the cast album and have accepted the terms of the world the writers built, I'm much more willing to enjoy it as it is. The same can be said for Dear Evan Hansen, in my case.
So, yeah. I hate going into musicals blind. Between not being able to catch all the lyrics and keep up really effects my experience.