Perhaps because their majority was so large, Democrats actually had to take fewer steps to break filibusters this Senate than in 2007-2008. In the 111th, Harry Reid filed 136 cloture petitions, down three from the 110th. And according to Senate record keeper, Dems held fewer votes to invoke cloture this Congress than last -- 91 compared to 112.
That may make stories about incoming class of Democrats toying with the idea of modifying some of the Senate's rules more explicable.
Update: A graph showing the filibuster trends is below: