The token's time had come. Hopefully, the rest of the site won't feel too odd (but let me know if it does - especially the font for the article text).
The real reason for the change wasn't to mess with the graphics, though - it was more to upgrade to the latest version of the Drupal software that runs the site. I'm sure you'll find some broken stuff - please let me know!
One thing that's missing is the ability to upvote comments. I stupidly didn't think to look until it was too late whether the software I was using for that had been upgraded along with the rest of the software. It hadn't There are alternatives, one of which I'll install.