Moto training these days tell the rider to keep bike in gear at a stop: much easier to avoid getting rear-ended by daydreaming, texting, food scarfing, coffee drinking, text reading, brain dead morons. I usually keep it in gear, watch my mirrors and maybe slip it into neutral after I have a few vehicle buffer stopped behind me if it looks like a long wait for light to change. I just don't trust drivers to stop and have had to move out of the way a few times. Avoidance time is lengthened if you have to put into gear. Safety first for me.
Forty years of habits and the fact that I don't live in a very big town means I don't really have to worry about the aforementioned morons. Plus, my commute for day shift takes place at 5am so I pretty much have the road to myself. Seven years of living in Vancouver didn't cure me of that either. I don't sit at stop lights with my truck in gear either. I have had to dodge the odd cager whilst sitting at a stop light minding my own business. I usually sit with my foot on the left peg so there isn't much delay in getting into gear.
At 150 Mile House we have a rush minute, sometimes all 25 of us leave at once.
The older I get, the faster I was.