One of the nicest things about 2011 for enhancement was that it wasn't 2010 any more. If you've been an avid reader of my column, you probably know by now that I think that 2010 will most likely (and hopefully) go down in history as the year in which Blizzard tried and was often successful at driving droves of enhancement shaman away from the class in masse. An overcomplicated rotation that still gave us the worst single-target DPS of any spec in the game, terrible mobility, lack of scaling from armor penetration (worst. stat. ever.), absolutely zero competitive AoE DPS ... The list of the bad things about the Icecrown Citadel/Ruby Sanctum era is worth an article in and of itself. In fact, I think we've done a number of those in the past.
So one of the best things about 2011 was the changes made to address a lot of those issues. Ancestral Swiftness gave us the normal bonus run speed that classes like ret paladins received, and since Ghost Wolf was changed to be usable indoors, we're much better at maximizing time on target. Armor penetration was thankfully removed from the game (coincidentally, I'm fairly certain that 4.0 saw a significant drop in headache medicines to WoW players), and the awesomely cool mastery stat was added in its place.