Haha I was there too. I remember he made thinking clearly seem so simple. What a humble man.

If I remember correctly, his talk was about how the world of science-the pure pursuit of truth-and the world of engineering-the practical application of solutions under constraints-had to learn from each other.

I'm glad you remember it as well! I didn't think to see if there was a recording or something of this talk, until now. It looks like the text of the talk was published here: https://www.cs.utexas.edu/~EWD/DijkstraMemorialLectures/Tony...

And the talk wasn't a random talk, but a memorial talk for Dijkstra: "The 2010 Edsger W. Dijkstra Memorial Lecture". I forgot this aspect as well!