Not exactly from AZ, but I did live in Southern CA so know dry conditions. Moving here was an adjustment without a doubt, but it is one that many have made. Central Florida is not as humid as areas south of here, but even with higher humidity levels and temps sometimes in the 90's, you might still find it more tolerable than the high heat of AZ. If you find the summer to be warm here, you just do things indoors.....much as you might be doing in AZ. One thing you might find a bit different.....sweat....in lower humidity levels water evaporation through your skin isn't noticeable ....not a good thing. Here you'll at least be able to notice that particular biological process....
My friends from AZ always vacation in the mountains each summer...they live near Phoenix and the heat starts to get to them after a short while. Here you'll find so much to do, and not necessarily in the heat and humidity, but in the nice atmosphere of all the wonderfully air-conditioned buildings that make up The Villages.