I never used them to be honest.
For one, I'm rather familiar with the overworld, which was mainly from playing A Link to the Past. Even though the overworld was slightly different, it was still very much the same in most ways, so familiarity natural comes in. Also, Hyrule combined with Lorule is still rather small and compact. I rarely get lost or forget where certain things are (items, peoples, locations etc.)
I just never really had any incentive to use them. It was eat if Nintendo to add them in, but I'd prefer the ability to draw on the bottom screen a la Spirit Tracks and Phantom Hourglass.