One of the keys to this season's success is the coaching staff figuring out what the strengths of the team are and making sure they are allowed to play to them rather than forcing them into a particular style. This seems to have engendered a lot of confidence on both ends of the court. Oh, and players aren't summarily yanked, thus they aren't playing scared.
Players have freedom to play and shoot. It must feel so good not to play scared. That could not have been fun.