We live in southeast Pennsylvania, too. My first trip to Disney was with my family when I was 18 (I'm now 45), and we drove to Virginia and took the auto train. Don't remember tons, but I do remember that the trip was long, and the train wasn't that clean. Our first trip to Disney when I was married and with two kids- we went into Philadelphia and took Amtrak-the biggest mistake of the entire trip. The trip took 22 hours due to numerous delays, the food was terrible, and the bathrooms dirty. My husband also had trouble sleeping on the chairs. Since then, we either fly or drive. Personally, we like driving. We leave at about 1:30 in the middle of the night, in order to go on I-95, but miss the traffic through Philadelphia, the beltway, etc. Now, I know that there are other, less traveled routes to take if you are not into middle of the night trips-(one is around Harrisburg-not sure of the route numbers). This gets us into Georgia where we stay the night and then we arrive in Orlando by early afternoon the next day. We are a family that stops a lot-bathrooms beckon me, and we stop to eat and relax at mealtimes. Another nice thing about this-at least to us-upon arrival we check in to our room and relax until late afternoon. Then, we do a character meal, etc, go back to our room and relax for thr parks the next day.
Now, I have seen flights out of ABE for $59 one way. We have also flown. I like that, too, but after 9-11 I just feel that air travel is a hassle to avoid if possible.
Keep in mind when you fly that you still have to get to Disney. We have never rented a car, because we never felt like we needed one, but there is still the cost of the bus, town car, etc.
Hope this helps.
Kathy