You know. Kick me in the face, but I don't use a light meter. I just flip out a grey card with black and white and take a shot and go. I usually do another card for every light change. It lets me quickly see breaks for post processing. It also helps later. I am pretty good at guessing the temperature after an initial custom WB.

On the other hand, if I could stop buying lenses I would probably stop and buy a meter.