I'm with Genghis. I fly from an airport where the RT varies from the hectic to very quiet. There are 5 commercial training companies, 4 fixed-wing clubs and a helicopter school. There are also various airlines, a government contractor and other small operators flying out of here.
During the day it is busy, occasionally difficult to get a call in. However due to the pattern of use, by 18:00 it is quiet, then I will occasionally say hi to a friend in the tower or on radar. This can even be useful, as it lets them know it's me, and they get used to the fact that I am an experienced pilot and instructor, so I can be asked to do more to fit in with their needs to facilitate traffic flow whenver they hear my voice.