Er, Howard's their only big. I bet even JO could handle him if need be, but Shaq would probably be good to go by then, if he ever will be.
I mean, at least with Howard, it's contain him, everyone else probably folds. The Heat do still have 3 guys that need to be contained and will get calls in any arena. That may not pose as that much harder than Howard, but I wouldn't feel as scared of Howard considering the bigs we have and the fact that they'd probably be healthy (or more stable) by the 2nd round.
Keep in mind that doesn't include the fact that as the #1 seed, we'd probably get to face the Pacers, who we quite honestly would have a chance to sweep. Either way, that may not be considered such a taxing series as people think it will be for the Sixers or Knicks.