My brother-in-law and I had read this description and the reference to snowmobile trails criss-crossing the A-Z trail in the AMC White Mountain guidebook but didn't see any snowmobile trails at all. Perhaps we were tired and just missed it. Perhaps the snowmobile trails are hard to spot in the summer.
We did find the heavily used Ethan Pond trail spots easily though. They were just beyond the 1/4 mile sign and legal spots which made us happy. Mid-week in July it was just the two of us and two thru-hikers which was nice.