Doesn't need to be metal to have a bass or drum line that shakes your ass.

I wear musicians earplugs pretty much any time I'm in a crowded place because the people are the loudest and noisiest things. A quieter music act would be quickly drowned out. But, the earplugs help me hear everything better (the music, the people next to me trying to talk to me, general situational awareness) because they only block the damaging parts to the sound without muffling everything.

If you have ever felt the relief of silence after being in a noisy environment, musicians earplugs on a keychain with you always will change the way you interact with the loud world we live in. They have saved me from unnecessary stress, anxiety, and further hearing loss at work, on a night out with friends, crowded bars, clubs, outdoor events, conferences, malls. I appreciate well engineered sound design, like FEELING the sound wash over and through me. But bad acoustics, noisy people, and tinnitus stress me the fuck out.

TLDR: I wear musicians earplugs mostly because of people and they help me hear everything better and feel better even if they're not needed to avoid injury.