Miami is pretty nice. The traffic at rush hour is abominably bad, and their public transit is practically non-existent, but that just comes from incredible, unexpected growth. But there are some great things about it. Obviously having some of the greatest beaches in the world is nice, but there's lots more. The restaurant scene here is amazing. The only places that I have ever seen anything approaching this kind of quality and variety of cuisine in America are San Francisco and maybe New York City. And the city is pretty damned beautiful thanks to the tropical climate. I live in Coral Gables, of course, which is certainly more beautiful than other parts of the city.
And yeah, even in Miami you don't need two air conditioners to cool a place. At the hottest time of the year Miami sits in the 90's. The place I moved from (Southern Utah) commonly hits 115 in the Summer. 3-inch cockroaches suck, but they aren't really much of a problem, especially if you don't live like a slob. Roaches live outside. They venture inside only to find food. If you keep your house clean, you won't see many roaches. I probably kill a roach once a week or so.
I was dreading the heat and humidity when I was getting ready to move here, but I was pleasantly surprised. I find that I actually prefer the humidity, and it isn't nearly as hot here as I expected it to be. I do love the snow, though, and the distinct seasons. I doubt I will make Miami my permanent home, but I do like it quite a bit.