I think some of the toilets could've been planned out better to allow more capacity but yes the queuing is likely something that will ease over time as people get used to the stadium.

At the moment it's all new and people tend to head to the nearest thing they can see. As people learn where everything is hopefully the queues will disperse around the rest of the stadium.
And as long as they're not employing completely new staff every game the beer service should improve and speed up.