Nuts always has a collar on and it does have a bell. He is indoor only but sometimes he wants to go outside to say hi to the ferals and if he were to take off I know he'll end up back with me due to the collar and tags.
I have a second very important and lifesaving reason why Nuts always has his collar and ID tags on. Nuts is FeLV+ and he will be euthanized if tested if he were to end up at a shelter or rescue but with the tags I will be contacted and can get him before anything goes wrong and he ends up dead.
I like the bell because I can tell who is in the kitchen or hallway, etc by listening(and it also makes it harder for me to step on him. I iwsh I could put a bell on Dexter's collar as he is always under foot and getting stepped on or accidentally kicked or accidentally kneed.) Ironically enough a 12.5 lb cat running sounds the same as a 25 lb dog so if I hear a bell I know it's the cat if I hear just tags I know Dexter is exploring and if I hear both I know the dog is chasing the cat

Nuts ignores it, Dexter ignores it, Paul ignores it and I ignore it unless I want to hear it. Paul lives right across the street from railroad track and a crossing, which is obviously loud, the trailer literally shakes when a train comes through and you have to pause the TV because you can't hear it over the trains whistling at the crossing, so a little bell isn't going to annoy me and except for maybe the first 5 mins I put it on Nuts it hasn't bothered him either.
Animals adapt, no one reacts when a train rattles through and that is LOUD, even the feral ignore it and they are outside. If they can ignore that I highly doubt a little bell is going to bother Nuts in the least, and he can be perfectly silent when he wants to.
Taryn