I do it. I won't sugar coat it: It sucks. Anytime someone sneezes too loudly in NYC, the whole region shuts down, creating lots of chaos. There are always major cancellations and delays going into that area. I'm at 9e, and we have a pretty good commuter policy, but even so, it sucks.
AA is always oversold. Spirit usually has the most seats, but not a ton of frequency. They have bailed me out a couple of times.