From the article: "Sure enough, the best invited talk was Michael Kiessling's talk that used the ancient technology of overhead projector, and it would have been even better if he only used the blackboard, and it would have been better still if he didn't use anything, just told us a story."

Exactly this. The fact that all of the mathematicians I've been around to date (except for one, but he's a ham, so he doesn't really count in this statistic since he already counts as a hacker :) have treated their overall field more like a science than an art has really disenchanted me from it. Yes, mathematics is regarded as the queen of all sciences, but I don't really buy entirely into that. It has applications there, and that's probably as far as it goes as far as science is concerned. (Disclaimer: I studied applied mathematics at a small state university at the undergraduate level.)

Math is beautiful not because it is full of intricate logical machinery and full of useful computational tools and full of pretty pictures; rather, math is beautiful because the intricate logical machinery can take different forms (how many different proofs of the FTIC are there? Pythagoras' theorem?) and because it's an imaginary world inside one's head where there are arbitrary -- even infinite -- dimensions and fungible axioms.

The point of these meetings is to inform (and even pique the interest of) your colleagues. If they have no idea what's going on and don't even understand the fundamental notions, what's the point? You're wasting your time, keystrokes, breath, and energy, not to mention the money provided to you by some grants.