I think we don’t use bells enough in this country.
It’s important the bell has a pleasant tone if that makes any sense.
I use mine a fair bit on shared surfaces where you have a lot of pedestrians etc that might have headphones on or might be in their own little world.
I’d always pass leaving plenty of space and slowing down a little to ensure I don’t come across as aggressive.
I’d often use it in circumstances where sailing past might spook someone... but I’d ring way ahead.
I think it’s just courtesy... in France if you hear a bell you just move over... I suppose out on the road there should be less use for it but as greenways etc start to develop in this country it’s a good thing to have on the bike.
I encourage my kids to use them all the time, but to use them in time and not aggressively.