The weather is our primary reason. We hate being stuck indoors for 6 months of the year. Prior to Wisconsin, we lived out in the DC area, which has much more mild, shorter winters, and so going from that to this longer/colder duration has been a challenge. On top of that, with small kids, there’s just more to do down there for them outside for most of the year. We really liked the vibe and bustle in Tampa.As a Canadian we face the same realites -- good birding opportunities for half-dozen spring/summer months then slim pickings/feeder birds the rest of the year. When I retire later this year I expect we'll do some birding trips but we have no plans to permanently move due to family ties. The way I look at it is that no matter where you are, in time everything becomes "routine" and can lose it's luster so it's just a matter of mixing things up and finding alternative things to do. Variety is the spice of life! Wintertime is when I get back into my model railroading hobby and after I retire I'm planning on delving into different photographic genres with the extra time on my hands. If I was going to move to Florida it would be for the weather, not the wildlife. YMMV.
As for wildlife/birding… if I’m uprooting, it’ll def be to a place that offers more than my current! Wisconsin is great in the summer, migration time is epic because the northern part of this state has the highest concentration of nesting warblers, so we get a lot of traffic. To be honest though, I haven’t been here long enough to discover all there is to offer, and given enough time my tune may change, but these winters outweigh that by a long shot.