Ive read many differing reports on how this affects your vehicle long term. The one that I found interesting dealt with wear and tear on the car due to engaging, disengaging of parts in the tranny, and linkage issues. Example, Jane only moves for "D" to "N" 16 times a day. Dick however likes to put the car in neutral at stoplights, so he moves from "D" to "N" 200 times a day. Thats more than 12 times than Jane. If moving from "D" to "N" could wear anything out, John would wear it out quicker. It feels like quite a jolt on the system when You do this, but I can just imagine the plant that tests car components before they are put into production moving from "D" to "N" in an idling car via a robotic arm more times than a Real Human ever would as a durability test.