I wonder how much cheaper it is to fly from Philly to MCO than from LGA to MCO.
For a family of 5 (us) to fly from LaGuardia to MCO, it's over $2000 round trip. It takes only about 3 tanks of gas each way (call it $300), about $150 for a hotel room to stay overnight on the way down (last year we stopped in Savannah, GA; coming home we usually do it all in one shot) and meals/snacks are incidental. It's a lot cheaper than airfare.
I also looked into autotrain and it's not that much cheaper than flying if you get roommettes. I don't know that I'd want to spend that amount of time in essentially a coach seat, let alone try to sleep in one.
We have a minivan - there's two adults and our 3 kids. They've been 6, 7 and 8 on our trips (triplets). We made activity binders for them which kept them occupied. They slept and read. Last year I bought a tMobile sync up drive so we had a hotspot in the car that they could use their tablets with to watch videos and netflix as well.
We usually leave at 4am on Saturday so we can get out of NYC and past DC before traffic hits. We stopped in Santee, SC the first two years to eat and sleep, and last year Savannah, GA. We stay at Hampton Inn which is my favorite moderately priced national chain. You get a continental breakfast and the rooms are clean and comfortable. On day 2, we wake up and have breakfast pretty early so that we can get to the WDW area around noon. We check in and see if our room is available, and we have "go bags" packed that we bring to the pool so that we can change and swim and eat QS lunch while we wait for our room to be ready.
Coming home we do it all in one shot, which is exhausting, but I like getting home that same day instead of the following.
The drive is very boring. I-95 is pretty devoid of anything to look at.