Here's what it boils down to for me:
My and two of my buddies want to run Flash Points for the evening, but we need a 4th. We queue into LFG and then go do whatever strikes our fancy until the LFG tool provides us with a 4th person. Boom, off we go to run Flash Points. Fourth person only wants to do one or two? Cool, re-queue, go do something else, LFG tool provides another person. Boom, we go off to run some more Flash Points. If the 4th dude is a rude douche-bag, we don't care. We don't need him to have a cheery personality in order to complete a Flash Point with us. He's a "Ninja"? Ah well, we just re-queue, our night completely not ruined by one dude's need for loot. He drops after 1st boss? Ah well, re-queue again. No matter what the 4th person is/does, we're still getting to run Flash Points at a better rate than if one of us sits in Fleet spamming LFG for four hours. We find a 4th dude that's cool? We add him to our friends list or invite him to our little guild, and boom we've been social. All I need to know about a LFG tool. Cross-Server would just be icing on the cake.
FYI: They've gone from "Cross-Server is not something we're considering at this time," to "Cross-Server is definitely something we looking into as an additional option." In less than a month.