I've been to the MIA boat show about half a dozen times. FWIW, the Miami Boat Show is not about cruising boats like usually discussed on TF. It is mostly the open fast multi-outboard boats that are popular in SFL, and fishing stuff. There will only be a few cruising style boats on display. Some accessories on display may be applicable to trawler type boats.
If I'm in town when it happens, I usually go. Mostly for something to do, not because I'm actually in the market for anything I would likely find there.
If you want cruising type boats you might want to go to the Miami Yacht Show. It is occurring at the same time, not that far away from the boat show.
IMO, the Palm Beach show is better for cruising type boats.