Not many "hidden gems" in this day & age of recruiting. Butch was able to find them 25 years ago.
More than half of the first rounders this year were three stars or below. They are there if you can find them.
I'd hesitate to call three-star types hidden gems though in 2015. Three-stars in the state of Florida are still getting offers from Miami, Florida, Florida State, Michigan, Notre Dame, Ohio State, etc. (on the high end). The mid-tier types are getting Rutgers, North Carolina, Arkansas, Virginia Tech type offers.
The state itself has upwards of 50+ 4-star types every year. South Florida has (safe to say) half of them. Another 200-250 or so 3-stars, with say, a third of them coming from Dade, Broward, and Palm Beach and a majority of those 3-star types are getting P5 offers and committing there. You'll get the occasional MAC or FIU/FAU/Bethune or non-P5 player in there, but if you look down the list of three-star players in South Florida, your hidden gems are getting offers from USF, UCF, West Virginia, Arkansas, Pitt, Northwestern, etc.
They may not be "Miami offers" but these are schools that, if they are showing you love since you were a junior, you aren't turning your back on them late for a Miami offer that just swooped in at the last hour because they missed out on 5 other recruits when Miami is pushing .500 seasons as mild successes.
As you say, its just different down here. A 3-star from Kansas might be getting offers from Kansas and Texas State. A 3-star from South Florida has 25 commit-able offers at any given time with many being P5.
Just a quick look - Looking at the 2015 prospect list on 247 composite. Three-star kids in South Florida that committed to a non-P5 or American Conference school (can't be clumping American in with MAC, CUSA, etc). 24 (doesn't include non-signees). Mostly FIU, FAU, and Marshall signees. There are over 100 three-star kids from those three counties rated as three-stars or better. Even if you're dumpster diving deep on the list, looking for lotto tickets, you're still seeing Rutgers types offers.