Restroom Lines in Federal Buildings?

I've never actually worked in a federal building, but I have spent a fair amount of time in them. And one thing I've never seen is a line of people -- men or women -- waiting to use a restroom. So with members of Congress concerned enough about potty parity in federal facilities to hold a hearing on the issue yesterday, I have to ask: Is this actually a problem? Are there federal buildings where women have to wait in line to go to the bathroom? If so, that's a serious productivity issue.

Or is it just that lawmakers just making an issue out of this because they want to show their support for potty parity where it really matters -- in sports arenas, theaters and such? The one such federally operated venue like that I'm aware of -- Wolf Trap National Park for the Performing Arts -- didn't seem to have a problem the times I've been there recently.