The picture superiority effect should be used over death-by-bulletpoint for two primary reasons: 1) people actually learn with slides that apply the PSE, 2) people will be engaged with well-designed slide as opposed to bored with a slide full of bullets, and 3) visual presentation is visual, so applying the PSE turns your slide from a document into what it was designed to be: a visual communication medium.
Do you use the picture superiority effect when designing slides? How would you explain the purpose of the PSE?