Another difference between MIA and GS is the way they play and the type of players they have.
Neither LBJ nor Wade are good outside shooters, and both of them were used to dominating the ball prior to joining forces. In Toronto, Bosh played in the post a lot more, and then became more of a jump shooter with Miami. So they all had to get used to playing different roles.
With KD joining GS, the way they play really won't change at all. It just makes them a lot more deadly since Curry, Thompson, Durant, and even Green can shoot from the outside. They all move well without the ball. You can't double anyone, because if you do, one deadly shooter will be wide open. But even if you're in front of them, Curry, Klay and KD are more than capable of taking you to the basket.
Playing D on this team is going to be hell. Initially, not many people said this about MIA. Sure, everyone knew guarding LBJ, Wade and Bosh was going to be hard, but their weaknesses on offense were obvious. At this point, it doesn't look like GS has many weaknesses on O.
A lot of people are talking about how the Warriors D is going to suffer, and that may be true. But honestly, if they're putting up 120 a game, who cares if they give up 105 a game?