At least one of the queues mentioned here would have been due to this:

https://na.finalfantasyxiv.com/lodes...3d8c81fb5ca046

Now that we have the ability to log into a different world when our own world is congested, it's going to spillover to other log in queues when one world is down. With EU only having 6 worlds per data center instead of NA's 8 or JP's 10-11, one world going down will have that much more of an impact.