Hearing is a backup sense.
That might vary by person, but for me it's not. If I had to pick between being able to see and being able to hear, it'd be hearing, hands down. Being able to see is amazing and I'd miss it, but hearing is just a whole other dimension.
Being able to know how someone is feeling, just by hearing their voice. Listening to music and hearing all the shapes, colors, and feelings that come with it. The colors aren't always ones you can see, like blue or yellow. It's hard to describe. I'll close my eyes and just listen at a concert (not the whole time) and same with TV, a lot of times. I usually remember it better that way.
If I have to find something in a backpack, I'll often do it by feel. I probably look like a raccoon washing its food, but it just works for me. You can tell things apart by feel and sound.
I've been able to hear that too, for as long as I can remember. I don't think that's necessarily anything unusual when you're the type of person who can hear earthworms cough. It sounds different at different times, like if I'm stressed or dehydrated.
There's really a lot you can hear if it's quiet and you pay attention. Eyes opening and closing, eyeballs moving, joints moving (neck and spine sounds different than knees and elbows), muscles contracting (different ones sound different).