Skied Okemo on December 30th and it was not a great day, but it's all due to Mother Nature. Not enough snow and too warm to make snow.
My biggest problem is certain slopes become too busy because of they are the only ones available and the conditions on them become dangerous. Lower Arrow in particular becomes bad in the afternoon, especially since most people use it to return to the base from Solitude and Jackson Gore.
Cold and snow will make it all better.