I just watched this entertaining TED presentation by John Maeda, president of the Rhode Island School of Design, reflecting on his career as a designer (more information about him in the linked TED post).
The most interesting bit comes mid-way in the presentation. John shows a video how he orchestrates an excercise where people need to get other people to draw things on white board using their "voice commands". After some miscommunications the groups starts designing a coordinate or grid system (similar to a PowerPoint canvas). The maximum output of the excercise was a completely boring, 2-dimensional drawing of a house.
I often feel the same. How to make this 3D composition? How to add quality hand-drawing or artwork? How blend different images? Computer constraints determine the majority of my slide designs. Something is still missing in the human-computer interface.