To this point above, in my experience I have often spent any amount of time going over personas, research, problems and our approach as comprehensively as I can, and have often lost my audience who are unable to connect the dots especially with format like wireframes.

So I am now presenting more and more hi-fidelity prototypes so user can follow the story and relate to how it will be unravelled in the product's design and experience.

Last but not the least, I keep in my arsenal a 2-minute video teaser of how the app/website will work with music, voiceover and animations to often end the meeting with a round of applause and standing ovation!