I've been using Ubuntu since 2006, so for me the novelty has worn off. I think the release of 12.04 was a big step toward improving the look of Ubuntu, however they still have alot of work to do to improve the speed of Unity, the Dash and the Application Market. My computer is alot more powerful than my android devices, so I expect similar applications, with similar cababilities to function at a good speed.
Other than the improvments to the look and feel, 2012 has been a relatively uneventful year for me when it comes to Ubuntu. Nothing has got me excited.