Have used vapor barrier socks in very cold environments, but believe in getting into the habit of changing socks frequently. Allows you to actually *remove* the accumulated water with each change of socks.
"Waterproof" socks can be a barrier depending on its rating, but may as well just wear wool.
Keep the feet as clean as possible, use moisturizing lotions/protective coating in harsh conditions.
Wool/wool blend spares don't weigh much.
BTW, typical Goretex/leather boots are designed for limited seasons use. If trips are likely to encounter really wet areas, would recommend a rubber-type with or without insulation "muck" boot. "Sno-Pak"-type boots work well, too.
For severe terrain more of a "mountaineering" boot may be better for your feet in winter.
