I do it for reading sometimes mostly papers, I just find it a bit easier to read through something without distraction and easier on the eyes. That and it sits on my desk until I actually read it.
You copy with a pen or pencil, like the monks did.
Yes to cut and paste with scissor and glues.
I do love an e-ink display, but I just like holding a sheet of paper, and not having to jump through menus to read something especially if I'm actively referring to it and revisiting it. Plus I can use my coloured fineliner on it, whereas the PDF viewer on my iPad crashes sometimes crashes if you look at it funny.