Part of the success of the painting mechanic is how smoothly it controls. Popping in and out of a wall is super-fast, making it easy to do at will. That's just one piece of how refined the control system feels in general. The circle pad allows for omnidirectional turning and sword swipes. This isn't accurate to A Link to the Past in the slightest, but it feels like you remember. After 2D games that stuck with the four cardinal directions and 3D games that were stylus-controlled, I'm now pining for more that use this overhead perspective with omnidirectional controls. It just feels great.
The 3D effect is a practical necessity for only a handful of puzzles. The world is richer with it on, but those who have bought a 2DS
Link haggles over some items with Ravio