Hurrah!
One example: Pilot of an aircraft calls up, with the intention of transmitting overhead. He is given airfield details and requested to call again when overhead.
Pilot of second aircraft calls up, same intentions, not having heard the first pilot call. He is advised of the first aircraft doing similar.
Neither pilot yet in visual contact with the other.
First pilot reaches the overhead and calls simply "Overhead", because that's what he was told to do.
Great, but far more helpful if he called "Overhead, 2500 feet, heading north" or whatever, as appropriate.
Not clogging up the frequency and certainly helping to improve the big picture for everyone.