We also have on/off and dimmer control right at the counter level for segments of mirror lighting, maybe 2-3 stations per segment. It's super easy to keep the overhead lights on all the time, and just turn up the mirror lights when it's time to put on makeup. Otherwise, the room gets too warm too quickly.
(Conversely, at nap time between shows, sometimes people will turn off the overheads and turn on the mirror lights at a very low level. Super cozy.)