On the forums today, Sapience mentioned a record that the Helm’s Deep Beta broke.
It’s the first expansion that we’ve had since Shadows Of Angmar that required us to add servers to the beta world to match the number of players trying to log in and participate. It was the first beta since Shadows of Angmar that actually tripped our login queues on the beta world and forced us to raise the max player population.
As a Beta participant who had a login queue , I can confirm this to be true. I have not had a queue on any previous expansion Beta.