It was by far my favorite mode of travel for my commute. The scenery through the Gorge and relaxation it brought me relative to the drive were so valuable. I got to know the staff, and in the evenings, could kick back with a beer in the observation car while looking at Multnomah Falls.
I'd rather spend 2x the time on a train and have the full time be usable than driving, where I would always show up stressed out and feeling behind in my day before I even started.
I also took it eastbound one time to ski in Montana. That was wonderful. I boarded about 7pm, dinked around on my computer for a couple of hours, fell asleep, and woke up at a world-class ski area where I could walk to my motel, catch a bus to the slopes and back, and walk to a top notch concert downtown at night.