I'm thinking he's talking about an auto tranny. I thought about this too, and I think the only thing it would wear down is probably the shifter itself. from going back in forth between drive and neutral would wear the spots in between each gear you can pick on an automatic (can't think of what their called off the top of my head).
Because an automatic is controlled/shifted by fluid power, there is very little, if no wear at all from shifting, because it's engaged and disengaged by transmission fluid. I think that most of the time when transmissions go out or slip, is due to dirty transmission fluid. People always remember the 3000 mile oil "rule", but not the tranny one. you need your tranny fluid changed every 12000 miles or so, depending on the vehicle and the type of driving you do, along with the tranny fluid filter. Some people might just do an analysis, and change the filter if the fluid is still good.
You won't get wear on your TRANNY for shifting into neutral, just after maybe 130,000 miles, you might have some play in your shifter. Mine has some, but it feels regular, and I've got over 130,000 on mine. Also, when you change your tranny fluid, make sure to adjust the bands if it's that type of tranny.
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