Too many misconceptions being posted here by those who scorn recumbents.
I do sit in a seat and do so precisely to eliminate weight on my hands, pressure on my shoulders, or on my neck. All of the weight is not centered on a small part on my butt because the trike I currently ride has a 25 degree seat angle. It is laid back enough to spread the weight out across most of my body, principally my butt and back. It truly is like riding in a comfortable lawn chair. Sometimes when I finish a long ride I sit in it to relax before getting up. Only one of my three trikes has a head rest and it does not create any discomfort on an extended ride. It positions my head perfectly to look through my progressive eyeglass lenses. I've never made any changes to a recumbent seat in order to make it more comfortable.
Somewhere I have a picture taken of me years ago about half way on a metric century ride on a very high quality road bike (Motobecane Le Champion). There's no smile on my face, just a look of grim determination. I think that's why it made it into the local newspaper reporting on the event. That's not how I feel these days after riding the same distance. By the way, my trike will climb hills quite well. I've never walked it up even the steepest hill in my area. They weren't fun at first but now that I have developed my "trike legs" I just consider them part of the ride and don't go out of my way to avoid them. Sure is fun going back down.