The stand-by line, especially early in the run, is your friend. Head straight to the park after work and sit and wait. Go to the stand-by line on a day that was rainy in the morning, but clears up mid-afternoon. Go to the standby line when it might rain. Go on a weekday.
In general, whatever you do, don't wait until the end of the run. If you can, see it within the first week. If you wait in line in the morning, get there no later than 7. But don't wait. Go see it as soon as you can. I was lucky enough to see Twelfth Night several times a few years back, mostly via stand-by, and that line got pretty insane by summer's end.
It's honestly not bad. Pack some food, some games, a book, a pillow, bring a friend or two, enjoy the runners and the puppies walking, and your fellow line-mates, order delivery to the line, and make a lovely day of it. There are worse things than spending a summer morning in Central Park with fellow theatregoers.
"I'll cut you, Tracee Beazer!!!!
...Just kidding. I'd never cut anyone." -Tina Maddigan, 9/30/06, WS stage door
Avatar: JULIE "EFFING" WHITE, 2007 TONY WINNER. Thank God.
I'm thinking about legally changing my name to Lizzie Curry...