Not a 'half back' in the usual sense of the term; we moved from metro NY to our Waynesville home in Sept 2001.
We spent 4 years here full time, and got the '4 year award' for living at 4800 ft elevation, and 'enjoying' those much colder winters from 2001 through late 2005. Winter at this elevation is as long/maybe colder than we had in NY, 800 miles 'north'.
Bought a golf course community house in North Naples area and did 8 winter seasons there. Got tired of 'Naples' and bought a new golf course community home in Venice area, and have spent the past 4 winter 'seasons' there at our EscapeWinterHouse.
If one chooses to do the two house situ, and can afford it, it is a good life style but with some considerations, imo:
-We have two sets of friends/club friends et al. We have 'more/better' friends here at our mtn situ because we were here longer, we were here full time for 4 years, and we spend 7+ months 'here' vs only 5 months in FL.
-The Paper Chase of bills coming in for two houses; we do autopay on several, but two sets of full utilities, insurances for stuff, mail, etc can feel sort of never ending. We use the simple USPS hold/forward and it works OK. Some choose to use the special weekly batch from one house to another.
-Maintenance: unless one has a condo in both places, SFHs tend to get some wear and tear, and most SFHs don't 'like' being completely or nearly totally 'shut down'. And, SFHs require a trusted occasional house watcher or good neighbor to give them some TLC, while one is gone for months.
-Cars: where to title/reg, leave one at one house, etc. Not insurmountable, but a consideration.
-Shutting down/opening up one house or the other: most SFHs are not turn key. Some condos are easier, but we aren't condo people.
-I am in decent shape and walk 15k to 20,000 steps a day & 30 - 60 'flights of stairs' equivalent, here at our Mtn home. I walk about the same daily at our SW FL house, (few 'stairs', however), but at 70, I can feel the diff when I get home from FL, here at 4800 ft elevation vs having been at sea level for 5 months. It takes me a couple days to get back in the groove. I feel I lead a much more 'vigorous' lifestyle here in the Mtns vs SW FL, partly due to more 'yard work' here, outside doing stuff all day long, and trudging around/breathing at this altitude vs sea level and our very suburban house there. Less active people and lower elevation people may not feel much change.
-I like SW FL. My wife loves SW FL. I would like to be at our Winter house for Dec through March, but we do longer, per my CEO.
The 'change' of climate, change of scenery, very different topo and lifestyle is a nice change. It is much more suburban/crowded in FL vs western NC. It is a much older crowd, as we have many younger friends here vs FL.
I doubt I could live full time or even much of the hot months, eg May through Oct, in SW FL, but everyone has their own bag. I could live here at our Mtn home full time again, if I had to.
-Even with a low effort house/condo here/there, packing up, shutting down, loading car(s) and migrating is not like taking a drive for the day.
The Migration Process becomes more standardized, but we get older/less physical each year, fwiw.
-Cost: no getting around it. Two houses, maybe two clubs, (of some kind, golf or social or boating), two sets of RE taxes, utilities, et al cost money. Some people move to FL live in 1000 sq ft condo, eat the 4:30 left over specials at the diner, etc., and think they went to Valhalla. Not for us, but I understand different budgets.
Not a lifestyle maven, but I might recommend renting a few weeks here in western NC, (Autumn is spectacular, but more crowded and more pricey), and then maybe rent a place in FL, (big state, where to go? Good luck!), and try that lifestyle out.
Long version, but hope our experience is good info for you, and others considering a two house situ.
GL, mD