We lined up at Gate 13 this past week because that is where "everyone" said to line up. There is a planter centered directly behind Gate 13, so although the line there wasn't any shorter than the other lines when we arrived (30+ minutes before park opening), I believe it ultimately was shorter for people behind us because the planter made it more difficult for people to get in line.
When we were there on Wed, Thurs, and Fri of last week, the line for Gate 13 did not feed into any other Gates...maybe it does other times though, I don't know.