And this is the reason the HAM radio repeaters are quiet. GMRS has in a way turned into HAM radio, going beyond what it was intended for. The original intent was for situations that you needed communications, but didn't want to go the full route of a commercial license on Itinerant frequencies or MURS. GMRS is a nationwide license (commercial frequencies outside SOME itinerant licenses are NOT nationwide) you can use with family, and other license holders. We of course have transitioned beyond that to rag chew when it's not being used for the original intent. Repeater linking is a lot of what makes that possible. I have 3 repeaters on the tower. One is the tower owners (725). It is open but all users are requested to use my unlinked repeater (675) for local comms unless the repeater is busy. Then there is the 600 that is linked. It gets a bunch of traffic. Some of it is local traffic for the link but much of it is from other repeaters on the system. The 675 see's maybe 3 hours of use a week and the 725 see's less than that.
So area of coverage has a lot to do with how busy a repeater system will be. Stand alone repeaters in medium to low population densities are not going to have much traffic outside the system owners. Large multistate systems that cover multiple high density population centers (Chicago, Indy, Columbus, Milwaukee, and most of the state of Indiana and Illinois) will obviously be busy because there are more people in the coverage area so you have a higher possibility of people being licensed in the coverage area.
You mentioned pre-arranged comm's. That's a NET in ham radio. And we do see traffic during nets on ham. But very little normal conversation.
And in truth, everyone has a cell phone. Your wife, the kids, the neighbor down the street. So when you tell Jr to take a portable radio you get met with "Dad, I have a phone, I don't NEED this stupid thing" or better yet, try putting an antenna on the wives car. "That ugly shit is NOT going on MY car." Figure out how to get past that and you are getting somewhere. Otherwise, be happy that you have a hobby that you enjoy and hope it doesn't go away in your lifetime.