In addition to going to the theatre a lot, I also love going to rock concerts. That being said, most rock concerts are louder than any show on Broadway.
I agree with Mamma Mia's act two opener. To me, it has to do with the volume of the music and the fact that it comes out of nowhere to start act 2. I don't feel the same with the start of the show because even though the volume is the same, the pre show announcement takes away the element of surprise.
I also don't like gunshots at all. To me, it doesn't matter if I have seen the show before and know when they are coming. I will still cover my ears for them. I have very sensitive hearing and that is something that makes me jump and unhappy regardless of if I know it's coming or not.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll