At the end of the return trip, I overheard a group of four other travelers saying that they got so much work done, they should just ride the train back and forth every day.
Seat and ride comfort are totally different as well. To me, it's well worth trading in some time for a much better travel experience. I've had a year where I logged close to 50k air miles in coach and over 10k train miles in coach, so I've seen the good and bad of both modes of travel (on and off the NEC for the trains).
For the long distance trains, I consider the time it takes to travel one of the benefits. In today's highly connected, highly active world, I find having 24 hours to simply look out the window and be alone with my thoughts to be incredibly rejuvenating.
And I can't believe no one has talked about how much better the seating is than any other form of long distance travel in the US.