I don't know if other servers have this problem,but if I want to do a flashpoint, I spend hours LFG. Tons of people on my server say the exact same thing. I think because it's so easy to solo your way to 50, people tend to do exactly that instead of bothering to interact with other players.
There needs to be either something to encourage people to do flash points like class quest bosses in the flashpoints or something like that or cross server flashpoints. The way things are right now isn't working too well.