The problem is that no one uses the filibuster they simply threaten to use it and the rest of congress runs in fear. If your going to threaten to do it I suggest you show up on the floor with a stack of newspapers and phone books to follow through.
The Senate rules changed in the 70's to allow senators to simply offer intent.
http://en.wikipedia.org/wiki/Filibuster_(United_States)
Guess which party changed the rules?