On the other hand, there are numerous animated films I've seen on DVD in the last few years (Despicable Me 2 being the latest example) that had entire sections that clearly existed for no other reason than to justify the 3D ticket price.
I enjoyed Gravity, the 3D effect occasionally added to the experience and didn't detract much. I wait for the next time 3D really adds to the experience before I do it again, and I'm guessing that will be a long time.
The 3D ads before Gravity started (including Hobbit 2), on the otherhand, were often unwatchable.