If you have a basketball player that has trouble with always looking down at the basketball when they dribble, then partner tennis ball drills are a great tool to use to help cure them of this. By using a tennis ball in the drill, you force the player to keep their eyes up the whole time. This basketball drill also helps to work on the players hands as well.
So whether the player is a ball handler or not, this is a good drill to use. Big men need to work on their hands for catching the basketball and finishing around the basket. Also, if your players are struggling with communication this drill can help work on that as well, because you can make it so that the player have to communicate on each toss.