Exactly. Shooting a simple tiny slow 9mm (classic pistol cartridge, used ie by cops/military everywhere) has in indoor range such a blast you feel the3 shockwave in your guts. Even with hearing protection its a very intense experience that you need to get used to. You simply don't get anything similar elsewhere, unless some big fireworks blast very very close to you.

Not using ear protection constantly around guns will degrade your hearing significantly and permanently.