I'm in the "its a valuable tool" camp. We recently completed a 4000 mile tour, and when I was driving I had the cb turned on low volume. Almost never heard anything. The one day we had to travel when the roads had some ice on bridges, etc, there was lot of chatter on the cb about road conditions, which I find helpful. It has also allowed us to detour and avoid massive traffic backups due to accidents.
We also have a handheld Cb the DW uses for giving guidance when we're backing into a tight campsight.
Fred