Simple design, intense content.
If you like overheads, you'll love PowerPoint.
Clutter and confusion are failures of design, not attributes of information.
In general, I think audiences are a lot smarter than people think. So, it's not "know your audience", it's "respect your audience, and really know your content".
The world is much more interesting than any one discipline.
It is not how much empty space there is, but rather how it is used. It is not how much information there is, but rather how effectively it is arranged.