Sounds like it depends on where you intended to go in the UP.
Calumet to Copper Harbor on Saturday and had excellent trails. Americinn in Calumet and Trailside Lodge were full with trucks/trailers/sleds but we hardly saw anyone actually on the trails all day. Mariner in Copper Harbor was packed due to Copper Dog 150 finishing their on Saturday but again, hardly met anyone on the trails we took.
Driving up it appeared to be hit or miss with trails as some areas looked really good and others bad then good again.
I always hear this place or that place was a zoo but New Years in Silver City/Bergland area I was told to go north but ended up with two days of excellent riding out of Silver City. Last weekend in January we had bad reports all over but went to Crandon and put on over 400 miles on great trails north, east and south. The hotels were full of trucks/trailers and sleds but everyone had a great time and only really saw sleds at the bars/restaurants.
Its been a down year but the trips I have taken (four) have been excellent. Only cancelled one weekend we had planned.