BE
Considering Series 5 didn't have a Christmas special at the front of it - The End of Time was filmed well before filming on Series 5 got underway - there was no need for a Doctor-lite episode, much like Series 1 didn't need one in 2005. That did have Boom Town though which wasn't Doctor-lite but for saving-on-budget reasons, and The Lodger was probably the 2010 version of this.
Compared to previous (recent) series this penultimate episode featured the Doctor in fewer scenes, which is presumably how they managed not to have a (noticeable) 'Doctor-lite' episode.
Considering Series 5 didn't have a Christmas special at the front of it - The End of Time was filmed well before filming on Series 5 got underway - there was no need for a Doctor-lite episode, much like Series 1 didn't need one in 2005. That did have Boom Town though which wasn't Doctor-lite but for saving-on-budget reasons, and The Lodger was probably the 2010 version of this.