On my last trip I had the chance to check out the Newark United Club in terminal C. It was a lot nicer than the Chicago lounge. Showers, Full bar, meditation room, business center, wi-fi, and plenty of seating - you can't beat that! I think this is one of United's nicest lounges (probably because it used to be a Continental lounge, RIP Continental :( )
They always have the standard snacks - cheese, crackers, snack mixes, and yogurt covered raisins. There is a huge bar area with a full bar (only certain beers and wines are complimentary).
Generally filled with business travelers, and on occasion some families.
It's a great way to pass the time at the airport!