You guys are still misunderstanding the function of the "mute" switch. It has been explained on here 1000 times. It works in EVERY app, it does NOT mute all sounds, it ONLY mutes system sounds (alerts, keyboard clicks, other random beeps and clicks, etc).
I didn't like it or hate it, but you've got to laugh when people actually claim they have been "mortified" by the change. LOL!
I'm happy for you guys who really hated the change, now you get the choice. I never for a second thought that Apple would make it a user-selectable feature, as we all know how much they go against user-choice in iOS.