I've only been once (2011) and am going back this year with my husband. I agree there are plenty of great matches on the outside courts, but don't cheat yourself out of a night match on Ashe! The atmosphere is electric!! Even nosebleeds would be worth it IMO. There are some who would probably disagree, but I love Ashe at night.
I think USTA appreciation day is that Friday so if you are a member I think you get to go into an indoor AC'd area and have a free beverage and snack? Get in line early is all I can say. Also, we always came in the South entrance near the Unisphere. Not sure it is worth the hike from the train, but the lines seemed much shorter at that entrance.