Definitely true. It can be really great if the main developers are actually using the IRC channel to coordinate development, but I think that can only really work when there aren't a ton of users to be poking in all the time. Kind of a Catch-22 problem; Linus would not be well-served to hang out on a Linux channel, because (as anyone who has seen his Google+ posts can testify) an army of sycophants would feel the need to interject their own non-content responses to everything he says. A small project, however, can still coordinate among developers while helping the odd user who shows up.