Hey there,
It's been 4 years, 6 months and 2 days since the NGE. It's a completely different game now and vastly improved. I'd recommend at least a trial of it to see the difference.
STAR WARS GALAXIES™ TRIAL PROGRAM!
There were some mergers, Corbantis, Europe-Infinity, Intrepid, Kauri, Kettemoor, Lowca, Naritus, Scylla, Tarquinas, Tempest, Valcyn and Wanderhome were all closed and Free Transfers were given to the remaining 13 servers.
Of those servers, you can see how the population differs from these stats:
SWG Galactic Civil War and Player City Statistics - 14th of May 2010.
Shadowfire is still up but one of the lower population servers, if you did have a character on one of the now closed servers Customer Services will transfer it to the server of your choice for free, more info on that is here:
[SWG] Retrieving characters on closed servers
I hope that helps.