A little insider knowledge goes a long way, making a person feel special, privileged, accomplished. Or, sometimes, just cool, which is how I felt when I had dinner at Burger Joint at Le Parker Meridien hotel after the author appearance I attended in New York City last week. (Hat tip to my colleague Hunter Slaton for the recommendation.) Burger Joint is a deliberately low-rent, uh, burger joint that’s hidden in plain sight behind a red curtain in a corner of the hotel’s elegant lobby — a cramped dive with scarred wooden tables, a cash-only policy, and a handwritten menu that’s limited to burgers, fries, shakes, and Sam Adams. You pretty much have to be looking for it to find it, which of course didn’t stop the line of customers — split pretty evenly between Manhattan scenesters and tourists — from snaking out the door last Thursday night at 9.