Aerie Peak (US) is still very active, there is even a good group of vets that have their own guild called <crit of gtfo>.(I am a member myself) You are welcome to join if you create a vet on AP! The friends list is very large every day i log in of f2p players constantly dueling outside of org. As well as decent queues for bgs! Seeing that AP is the most populated server for f2p players the more people that join the higher chances for faster queues. I don't regret ever coming to AP as it has made my f2p better than it has ever been before.
There are premade groups made very frequently as well as dungeon groups to get others geared.
If you are considering making a new twink or moving to a more populated f2p server. I HIGHLY recommend Aerie Peak (US)