Everything's been said here already, but the thing I've noticed is how nimble-footed he is in small spaces. He's very good at beating other rebounders to the ideal spot once he calculates where the ball is likely to come off -- not too far underneath the basket and not too far out, but getting to a spot about 2 feet off the rim at a trajectory of where the ball is likely to bounce.
He's not going to defend Chris Paul in wide-open space, but put him against Joel Embiid in a phone booth and Enes' feet are quick enough to let him carve out that little bit of space he needs to be in position for a rebound, and his base is strong enough that it's really hard to move him off that spot and his hands are strong enough that it's going to be really difficult to take the ball from him if he gets both hands on it.
Once he's that close, it's almost impossible to stop him from putting the ball back in. The closer you get a defender to the basket, the more it becomes about going straight up quickly. A 6-10 guy within 2 feet of the basket is almost impossible to stop, because the defender either is behind him or under the basket ... Rick Pitino called it "putting the defender in jail" when they're literally too close to the basket to be able to defend the shot.