simple answer is YES
their are many people that will use the forums for whatever software they use , and have no inclination or want to use IRC or mailing list full of spam etc
at least a forum keeps it's history , and problems can be searched , try that on IRC etc
but i can see that in certian cases there are too many channels open , and that to reach the majority of users a forum is the best place , after all some people may have not used the forum for a few months if at all , and wish to research a topic or problem , and consolidation for the mass users would be a forum , rather than IRC or a mailing list
remember more people read the forums , than those that post , it does not mean they are not Active .