I think Djokovic probably enjoyed his 2012 season a little better than 2011 despite the fact that his 2011 season was just phenomenal right up until the US Open.
While he ran out of gas after winning the 2011 USO and had nothing left in the tank for the end of year, this time round he paced himself much better, not busting a gut trying to win everything in sight, but winning just enough to keep his nose ahead of the game and thus had plenty of energy left for the WTF.
As a result, this time round he won both the first big tournament of the season (the AO) and the last (WTF). I think this may be why he looks on 2012 with a bit more satisfaction even than 2011!
"I have to apologise because I clearly pushed Roger so hard on Thursday!" (Andy Murray on why Federer couldn't play the WTF final).