I run into the same problem when lecturing. Students have an extremely difficult time just focusing on a speaker standing rigidly at a lectern, even if he or she has good diction and elocution. I've noticed preachers having the same problem. The better ones move around and run through the gamut of emotions, sometimes raising the voice in anger or indignation, dropping down to a quiet voice to cover some delicate material, indulging in mockery or humor, or stopping altogether to ask a question or to call on a student by name. One trick I learned was to work a student's name into the material. If a student hears himself being discussed, he will pay rapt attention every time, and will generally continue at least for awhile.

But to return to the subject at hand...I did try the multiple angles thing a week or so ago. Basically what I wanted to do was shift between a close-up, intimate view for certain bits and then a longer shot. It proved extremely difficult to do given my manner of composition. To do it right, I'd have to plan even more in advance so that I could break to the other shot in a way that made sense. Of course, I've also seen shows where the person's voice continues, but the shot is just the person walking around or perhaps doing something else (the voice becomes a voice over). That wouldn't really make sense given my setup, though. Of course, you would have to have a camera operator to do some of the fancier stuff, such as slowly swinging around or tracking your movement as you walk or lean.