I'm with skichick on this one. I have skinny calves, so maybe that's why I can get away with it, but if it's cold, I'll have my socks on, two layers of long-johns over them and all that gets stuffed into my boot. Zero problems. I use Hot Chilly's primarily, and the seams are on the insides too.
My boots are tight enough from the ankle to the toe region that I can't possibly wear even medium-thick socks so that would be just socks.