Thanks for the knowledge everyone!
It seems as if coasting in neutral on a modern automatic is ok as long as the engine is on (mccrews personal experience attests to this). And coasting with the drive wheels moving with the engine off is not ok.
According to this article (blog?) from popular mechanics :
Coasting in Neutral or Gear to Save Gas - Coasting and Fuel Economy - Popular Mechanics
coasting in neutral on an auto doesn't save gas. To be fair, this article is probably not a scientific quality, peer-reviewed study, and the writer seems to be a bit biased, but the logic seems to make sense. The argument of the writer seems to be that when a modern car coasts, the fuel injectors are off, so you are only experience engine resistance. When you shift into neutral, the fuel injectors turn back on to keep the engine in idle.
Interesting argument, but the issue with the article is that the 1 gph figure seems a tad high and the writer also didn't release the testing data.
With that in mind, I have another question
If you're parked in your driveway, and you want to move your car 10ft, is it ok to simply put the parking brake off, switch in in neutral and push it out of the way? Or is it better to to move it the normal way (turning it on and and reversing out)?