From this article:
The ultimate is “Less Than You Think.” It’s a pretty, conventional song for three minutes then ends with a 12-minute, machine-made drone that would test anyone’s patience.
The song is about free will and is partly an inside joke; the band wanted the longest song on the album to be called “Less Than You Think.” It also compels audience participation.
“It was another way to encourage listeners to exercise their free will – to get up and turn it off,” Tweedy said.
At least they admit it’s annoying. The rest of the album is growing on me. The intro to “Hell Is Chrome” is so Music From Big Pink. And I like that song that goes 123456789. 123456789!