I'm nowhere near retirement (sometimes I wish) but I do live in Florida now. My mom is in a condo in Mt. Dora -- not a retirement condo development though. But I can tell you that the entire Mt. Dora area is beautiful. Wherever you are looking in Mt. Dora will surely be nice.
Top of the World may have a location in central Florida, but I know of one in Clearwater. It is a retirement condo complex and each building is decorated/built to look like different corny castles. Quite a sight to drive by. But a lot people think they are great. It is very centrally located and there are bus shuttles that take residents out and about.
As for anything new in Florida about taxes or insurance, I don't know anything new. Ever since we had a few hurricanes blow through and criss cross the state, homeowners insurance companies have either gotten out or raised their rates astronomically, especially within 30 miles of the coast. My own policy was dropped 3 years ago, and I almost had to go with the state insurance of last resort -- Citizens. They keep their rates higher than the highest private ins. to supposedly encourage homeowners to go to all lengths to find coverage elsewhere first. It is hard though when no company will insure you. I was lucky to get on with State Farm, but at triple my previous rate. Yes, triple. And this years renewal has gone up again another $500 a year, pushing mine to almost $4000, which is really ridiculous on my small 3 bedroom house.
Good luck in your search.