I leave my EE at home except on vacations. I use it every day to read (mostly epub fiction), usually propped up on a tablet stand on a lapdesk over the arms of my most comfortable chair. I also take it outside to read in the sun. I don't read many pdfs, but it's nice to have that ability.
I take my PE with me almost every time I leave the house, and I read/play games on it in bed. I grab it off my nightstand every morning to check the news, my calendar, or my lists. Then I get up and switch to my EE.
Does that help at all??
I didn't "need" my EE either, but I'm glad I got it and have found I use it enough to (easily) justify the cost.