I found the trail pretty dry on the AT overall, with few creek crossings and none of any significance. Certainly the particular time and year could make a difference, but still. Some of the wettest trail was in New England, but so often there were boardwalks when it was swampy.

Foxriver liner socks: I use those too, and most often just those, adding wool outers in colder weather. They last quite well for thin socks.

Keeping feet dry in combat boots through many wet crossings: kind of blows my mind still. I have to believe that if the water body is deep and wide enough you're going to get some water infiltration at least ... but great that you've found a system that works so well for you.