I use gap shooting for longer shots, and instinctive for shorter (30 yards and under) shots. Since I don't shoot at game over 30 yards, I use instinctive for hunting shots.
Once I was shooting in a tournament in a group with a guy who was a really good shot. He was shooting better than I was on almost every target. Then we got to a 3D animal that was buried in some bushes, with just the vitals showing through a hole in the bushes. It was about a 15-20 yard shot. I put all my arrows in the kill zone, and the other guy was all over the place. I think he even lost one of his arrows in the bushes. I was wondering why, and then I realized that would have been a hard shot to make using gap aiming, as the bushes were in front of and all around the animal, and it would be very confusing to set a gap. It was a very easy shot for me since I was shooting instinctive at that distance, had no idea where the point of my arrow was, and was only focusing on the spot I wanted to hit.