Lines getting into SWF are not huge.
Their ticket machines work, so it's usually not a problem.
The baggage check is done just before the turnstiles, so having someone hold a place in line wouldn't really work.
The best idea is to get to the park 45 minutes before opening time (9am). That way, you'll be parking near the entrance, can get your tickets, and they usually let you into the first part 15 minutes before the official opening time. Go left, where you'll run into someone holding a rope. National Anthem plays, rope drops, then you go to JTA and Kraken for some walkon rides.