Hi, this will be our third time taking amtrak to disney. The first time we picked it up in Boston and then had to switch to another train in NY. We took it coach to NY and then we got a sleeper room for the remainder of the trip. The sleepers are quite nice, but very expensive but I was 7 months pregnant at the time and didn't think I could survive the whole trip in coach. ( I could barely stand the sleeper by the time we arrived!)
The second time we took Amtrak's autotrain which you have to pick up in VA, so we had to drive to VA to pick it up. We went coach on the way down and it wasn't too bad because it was very empty. On the way back it was packed so we were lucky enough to get a sleeper room. Lucky because it was me, DH, DS 3.5 and DD 20months and they put us in a sleeper that was suppossed to only be for 2 adults so it wasn't too expensive-but it was a tight fit! Overall a good experience, but again quite expensive when you factor in the cost to bring your vehicle.
This time we will be picking the train up in Newark NJ because my mom lives about a 1/2 hour from there and we'll sleep at her house the night before and this train goes straight to Kissimmee-no switching! We are going to rough it and take coach (gulp) both ways. Understand that lots of people have no problem doing coach, but may not have young children which if you have any you know makes pretty much everything more difficult! And we have 3 this time! (new baby girl)
and FYI, you couldn't PAY me enough money to take a bus all the way from NE to FL. Amtak has lounge areas and dining cars so you can walk around. We are considering renting a mini van and the rental co will p/u at the station, but we've taken a taxi before and it was I think about $50.00 1 way.
Good luck deciding!