Interesting that the Google image above is from 2017. Obviously it has been there for a while. I guess if they really only use it when things get backed up at the other security.
We were there last weekend and there was a reception in the courtyard near the DTD security. Everyone was watching the reception as they waited in line (which was backed up to the GCH sliding door entrance). In situations like that, it seems like it would have been a better idea to re-route guests to the Starbucks security.