I play with my friends on Tarnished Coast, a max population server. One of my friends g/f just bought the game, and since Tarnished Coast was full when she created her first character, she was forced to play in another server. My friend then left Tarnished Coast to join her. My other friends and I would have no problem leaving to join them, except for the certainty that we would never be able to join Tarnished Coast again.
We like Tarnished Coast, but there are no real ways to play the game from start to finish with players from other servers.
There should be a way to choose to join an overflow server and play each and every area with your friends.
An Unhappy Player from Tarnished Coast