Just want to give my 2 cents.....we moved here (Pembroke Pines) last June from NJ. I too was transferred down here with my pay from NY and let me tell you I am writing this at my part time job that I had to get to help make ends meet. I have been working 7 days a week since April, and my full time weekday job requires lots of lates night...so I don't know how much longer I can continue to do this. I look forward to the day I can walk into my bosses office and honestly say I just can't afford to live here anymore......Yes it is that expensive.
As you already mentioned, you have taken into consideration schooling. Private schools here are expensive and are about as good as a public school up north. I found out through a research project that all private schools need down here is a business license to open. The state does not have any other requirement, and when I was told how many of them close each year...I was shocked.

So please, please, please do your research before coming down here.
Housing is expensive, as are property taxes. If you want to live in a nice area, more than likely you will not live near a "downtown" area, unless you are looking at condos. So now you have to take into consideration your commute. I live 40 minutes from my office, while school is in session it doubles. Think about how much gas you will be spending. I long for the 1 hour door to door commute in NY....sitting back on the bus and relaxing.
My gas and electric bill up north used to be anywhere between $80 -$125 a month. Now I am looking at $200 electric each month. Groceries are expensive down here as well. I went to buy an apple for my DD the other day....$2.48. Not even in NYC did I ever pay that much for an apple. I have heard from many other NYers that they can't believe how expensive lunch is around here. This from the mouths of people who used to pay $7 for a sandwich.....same sandwich down here will go for $9-$10. I laugh when I see oranges....Florida oranges selling for $1 a piece. Yes, our diet has changed dramatically down here, not just because of prices, but because of selection, or lack thereof.
Now back to your original question of will it ruin the magic? Nope, with all the other cuts I had to make, the one I knew I would not cut is our Disney trips. So we bought annual passes and we love going and even DH who is not a big Disney fan always asks when are we going again....