I like the roomettes. I think they're comfortable and never feel cramped. For reference, I'm 5'5" without shoes.
I stash my stuff similarly to Amtrak Blue. I put my carry-on on the step to the upper bunk and set my purse on the lower step. Then I take my shoes off and prop my feet up on the other seat so I can relax and look out the window (or read, if it's nighttime).
Once the bed is made up, I like to put a pillow on the window rail. I fold my arms on top of the pillow and rest my head in the crook of my elbow while watching the world pass by. I do that every time I ride the train, as it helps me relax while waiting for my sleeping pill to kick in.
My ex-boyfriend was 5'9", so we never had issues sharing a roomette. We did travel in a bedroom once, as it was a lower price than the roomettes for that trip. While we enjoyed it, we actually missed the cozy aspect of the roomette and decided we would continue to purchase roomettes for future trips.
If my future traveling partner is tall, then I may have to give up my roomette for a bedroom, but I'd really miss being able to curl up against the window at night.