I switch mine on when I line up, and off when clear of the runway. I have always been told to switch off after vacating and I generally do so. When rejoining, I always switch on when I'm listening to the ATIS (after being told that that is too soon - but when I forgot entirely after thinking of it when listening to the ATIS I decided it's better early than never!)
Good on ya Newbloke! Don't let anyone tell you to compromise safety.