So I'm sure you know the situation, Aldis keep as few checkouts open as possible and when the line gets too long they'll ping someone to open another one and the people at the back of the long line get to be first in line at the new checkout.
So when I'm checking out and I see a very long line I'll kind of hang back a bit and let other people join the line before I hop into it, knowing that another checkout will open and I can be the first in line for that because the people at the back of the line join the new checkout. Anyone who has already unloaded some stuff on the conveyer belt, or is stuck in front of someone, has already made their bed.
I use the self checkout. No need to line up.