Sure did. But that was because the destination (festival) stopped letting people in days before because the amount of rain they received turned all their grounds into mud soup. Everyone stopped on the side of 91 and walked.
As long as their isn't a red light like there was for the festival, it shouldn't be too bad (until everyone turns around to head home - then, yeah, that'll probably be a mess).
The advice in that Plainfield VT post isn't terrible...a little hype, but sage advice. Don't wait until the 8th to get gas, do your grocery shopping, or whatever errands you have if you can help it. The locals are, undoubtedly, still a little scarred from that festival. Kind as they were, it consumed their lives in a way they really weren't prepared for.