Went in December two years ago. Spent one day of mildly terrifying peril up on the tops in fog and torrential rain, though climbing next to Sourmilk Gill (Seathwaite) in the pissing rain is quite the spectacle. Was so relieved to see the shape of the Honister Mine finally appearing through the mist on the slippery, rocky descent. Getting back to the hotel to dry out in front of the old roaring fire and a few pints of ale was pure joy. As you say though, cheap rates and the place to yourselves.
Also went one January - up Skiddaw in a blizzard was fun. Had to walk backwards to give the exposed side of the face a rest from the relentless icy blast. That was that day I discovered the mighty power of the humble flapjack. Then up one of Blencathra's ridges in the ice. Wouldn't do that now.