I did it. My layover was so long I decided to try anyway. I used the 3rd floor moving walkways to get to Term.J at the opposite end of the airport. Then when I got to the boarding pass and ID check the TSA person thought I was at the wrong terminal. i explained my next flight was hours away and I just wanted to get to a lounge. She was totally ok with it, and I went through security. Security, that was another story, so after the body scanner, I was taken aside for the infamous "pat down". I said, I thought the whole point of the scanner was to avoid a pat down? The TSA agent said that the picture wasn't clear enough. So yes I did both! What a stupid system.
The Club America Lounge in J was nice. Very new, lots of space, free finger sandwiches, self-serve bar, with juice and alcohol, and cookies. It made my hours of layover alot more bearable, now if TSA could be fixed....