OoT3D has a couple of things in it that make the game easier than original/GameCube in my opinion.
1. The Gyroscope makes targeting so much easier. The tank controls were a lot harder to cope with.
2. I don't know about anyone else, but it seems like the world was compressed so traveling is easier to do even on foot. That could just be me though.
3. Link's default movement speed seems increased as well, or maybe the animation is getting to me.
4. Less to no lag at all in certain spots that would cause frame skips on the 64 version make getting through cinematics and/or 3 minute timed sequences a breeze.
5. Skipping cutscenes makes everything easier.