Even in my internal company tech support line they play that "higher than expected call volumes" message, but their website also has counter on it that tells you just how many people are on hold and even when it is just one (me) it plays that message.
The only ones I believe are the ones that tell you the estimated wait time or number ahead of you (most of which offer to call you back).
It is funny to hear "our wait times are higher than average, your wait is estimated to be zero minutes".
Easy for that to be true: just set your expectations to zero.