Great ball handlers are able to see the floor, read the defense, and move wherever they need to go with the ball. This only happens though when the player handling the basketball become comfortable with their handles, and is able to make the ball an extension of their body. The follow the leader dribbling drill is going to help you work on this.
When doing this drill you are going to have to handle two basketballs at the same time, and then also follow the coach that is leading the drill. The player wont be able to look down at the basketball or worry about the ball, they will have to keep their eyes and head up the whole time to see the coach. Two ball basketball dribbling drills are designed to challenge the player above and beyond what they would normally face in a game with only one ball, that way in the game they will be more comfortable with only dribbling one basketball.