Our length on D will be very noticeable next season (if there is one). Rebounds and blocks definitely, but also in smaller things like tighter passing lanes for our opponents, deflected balls, cutting off drivers, double teams, etc. A lot of defense isn't really even measurable, it's just about making it as difficult as possible for the offensive team to do what they want to do without fouling.
Our ability to switch everything will be big- no pun intended. I'll be curious to see how we defend screens next year- do we hedge and have the on-ball defender come over the top? Or do we have the help defender remain under the screen and have the on-ball defender follow him under/take the screener? A lot will likely depend on who has the ball and whether they're a capable off the dribble shooter but our length will let us be flexible.