For Ferals, Season 1, Season 2, and the blue rep PvP gear has healing on it. Starting with S3, the +healing has been replaced with crit, hit, and armor pen. Make of that what you will for PvP.
For PvE, I think +healing on your feral gear is mostly wasted, whether it's soloing, 5-mans, heroics, or raids. You can get more +healing on a staff or MH/OH and just use a weapon swap macro or add-on. Or, you can take Nurturing Instincts as part of your cookie-cutter 0/44/11+6 Feral spec.