I don't think he's anything special as a coach. Bosh getting injured against the Pacers in the playoffs was a blessing in disguise because they were forced to go small and put LBJ at the 4. This is the lineup that propelled them to their title. Before that, Spoelstra was shuffling centers constantly before the playoffs, almost detrimentally to his team. Dexter Pittman started a game, underproduced, and very rarely got back on the court thereafter. Next game it was Turiaf, then the next it was Joel Anthony. Pretty odd thing to do team chemistry wise - especially late in the season - and not particularly indicative that Spo knows what he's doing tactically.
Doc significantly outcoached him in the ECF, not surprisingly. The only reason the Heat won was due to superior superstar talent and some very good breaks, as well as questionable ref calls. It's an absolute travesty that Spo has as many rings as Doc, but it is what it is.