While the PC is a nicer place to hang out than the food court, I would still rather eat my own young than to stay there for 9 hours! Not to mention that you might be denied boarding after 9 hours of free booze!!
Live a little! See the city! MOMA is a nice way to spend an afternoon. There are a hundred other ways.
Or even go across the highway and hang out at IKEA! Lame, but beats 9 hours at EWR!!