I personally have no problem with either 3D or 2D animation. I don't think 3D is lazy, take a look at
thislink. 5 seconds equals about one week of work. I'm no expert on animation, but a week doesn't sound lazy. More work does go into 2D, but 3D has harder effects to create. Correct me if I'm wrong.
But as to the question, which one do I like the most? 2D cel animation is my favorite. Especially that older Disney style where it looks sketchy.