More of the very large physical size, as in convection will cover a large area. Less land impact would imply a stronger storm though. Irene may start out with 50-55mph winds on the first advisory.

The usual TVCN/Concensus would suggest South Florida right now, so it's likely that Florida will be in the edge of the first cone, but it also would likely mean a track over Haiti too (Which could destroy/weaken the system ala Emily, but Emily also was struggling to develop the entire time it was active)