The steering wheel heater switch on my 2013 SV Leaf is a "push on/push off" switch with an indicator light in the switch body. Unfortunately, I can't see the light because the wheel blocks my view. To see the light, I have to bring my head very low, which is dangerous when driving.
I only use the heater in cold weather, and when I'm cold, my hands don't work perfectly, so I am not sure whether I pushed the switch, didn't push in the right place, or pushed it twice.
It would be safer if the switch were a rocker (like the seat warmer switch) so that I could feel whether it was on or off rather than having to take my eyes off the road.