Some people only get chances to go away on holidays when they are off from work/ kids are off from school so they want to vacation on a budget
Doesn't seem like vacation on a budget. Maybe if you stayed at a points hotel.
Also, different family-friendly activities that will likely create unique memories (if you haven't been to Orlando), access to a variety of kosher/yom tov amenities, location where your extended family can also participate and, if planned carefully, relatively affordable.
For a first time, yes Orlando has those unique items although now you're no longer relatively affordable. Parks are like $100 a person per day. Activities in NY/PA/NJ are much cheaper. Those Kosher/YT amenities are available at home. Extended family can meet you in NY at home as well.
I personally don't get it, unless the grandparents are sponsoring the whole thing. I also like the idea of Sedarim in my home. Of course if you're able to go all out at a nice hotel with catered meals and everything organized for you, that's a different story. The home-rental, make your own food, clean and Kasher anyway, is what's not for me.