If you have the time, Amtrak is a pleasant way to go. You are right about the seats. They are very comfortable and it is nice to walk around on the train and stretch your legs.

My most recent trip on Amtrak was from Effingham IL to Chicago. They only bad part about the trip was the last couple of miles in Chicago. The train stops just a mile or two away from Union Station and we had to wait quite a bit until it was our turn to move into the station.

Edit: I have been corrected by another commenter below. Amtrak owns rails in the NE corridor. Which explains why it operates so much better there.