Camels Hump - in my experience, in winter the Monroe Trail and the Burrows Trail get about equal use. I think it may depend upon which side of the mountain you live on.
Mt Mansfield - to approach this peak from the Stowe side means parking at the highway barrier and hoofing it up the road about 1/2 mile. This is a busy place, especially in a cold year, since there's some good ice climbing a bit further up in Smuggler's Notch. However, following the Long Trail to the top of Mansfield on this side can be difficult since the trail is often obliterated by downhill skiers and boarders from the ski area on the left. It can also be dangerous, as boarders sometimes use one section of the trail as a half-pipe, and there's very little time for either of you to react. Consequently, I gave up hiking on this side several ago, and now usually use Sunset Ridge. Or, as Louis points out, go up via Maple Ridge and down via Sunset - it's a great loop.