Many controllers live in West Broward County (Pembroke Pines, Miramar) which is not a bad commute via Interstate 75. I'd say most with families live in West Broward. Its relatively affordable and more new development. Single people are spread out. Many live in Miami Beach, Brickell, downtown Ft Lauderdale, Kendall. Some even live in Key Largo but that's almost an hour drive. Doral would be the closest option for living close to ZMA. It just depends on whether you're looking to live close to the action or not.
I've lived in Miami for 11 years. Key largo is way more than an hour drive, even without taking rush hour traffic into consideration. If you want a commute that is 45 min or less, you'll need to live north of the Kendall area and south of Miramar. The center is in the middle of Doral, so that and Miami Springs are ideal for the shortest commutes, but also commuting from Downtown Miami and Miami Beach won't be bad depending on the time of day (day shift will be opposite traffic, but you might get some traffic going in on mids and nights).