I regularly use ADE by editing the stock airports in FSX so that I can correct the airports. I normally like to fly out of EWR, so I edited that Gates in each terminals so that Newark Ground sends the proper airlines to their respective gates which they use in really life. And when needed, I also add gates in or I edit the size of gates to all for the various aircraft types in FSX. I then also edit some taxiways and taxi signs, and ground lights.
I've been at it since June of 2013, and I have roughly 50 US airports edited.