Exactly, don't be early, you get thrown in detention and held for a few hours. Count on 3-5 hours to get in, no matter what, if you arrive at a high-traffic time (Sunday or Monday).
Here's the most recent "When can I arrive
Note: In 2013 we don't know if the event will open at 6pm on a Sunday, or 12:01am on a Monday. More info will be available later. However, at least the last two years have been a 6pm Sunday open, with varying degrees of publicity in advance. This year, everyone knew about the 6pm entry. The year before, it was rumored, until very close to the event . . . (same with the year before, if I remember correctly).