It really depends on what you want to do. Most of the suggestions I see here don't let you game very well, especially for the taller individuals on this forum.
I had this same problem and after consideration, I found you sacrifice way to much IMO by using a coffee table, lap board, or laptop tray table/dinner tray table. All lack comfort and control.
My solution was a folding table but this one only had a width of 24 inches and 48 inches long. Its small, compact, and hides easily. You can get them from school supply stores local and online. The key is the 24 inch width, it makes it perfect for being inbetween the couch and TV.