I drive a 2013 Mazda 3, in case that makes any difference to the answer.
However, I developed this habit of putting the car into neutral at stop lights, and have been told by a few friends that this is bad for my car's transmission. This answer seems to agree with that assessment, but does not provide any convincing evidence that the wear on the transmission is significant.
Does putting my car into neutral at stop lights significantly damage the transmission?
In particular, assuming that I maintain all parts of my vehicle as recommended by the manufacturer, will this habit significantly increase the likelihood that my tramission will fail before other parts of my car do?