I really agree with the importance of using your tone of voice as a communication "tool" with your dog. Our facial expressions and body language are also very important, as is eye contact. I have even found humor to be an excellent way to diffuse a tense situation or to put a timid dog at ease!
Strange as it may sound, it has been my work with horses that has given me even more insight in working with dogs, than if I had only worked with dogs alone. Since a lot of the work I do is with scared, abused, and misunderstood dogs, I have to project a lack of fear when I am with them.
I really learned most of this when working with skittish horses. Although, dogs and horses are very different creatures, with very different psychologies...there is something we can GIVE to them of ourselves when we show good judgement and show no fear around scarey objects or situations. When an animal trust's your judgement and feels safe in your presence, their fear and wariness can be greatly diminished and may disappear completely, given a little time and effort.
The best way to learn about different training methods and philosophies, is to get to know someone who uses methods different from your own, as a person. The best way to teach others about your preferred methods, is to share your stories. The best way to get people to share their stories, is to listen.
PS From what I've gathered, this is a forum for both dog owners and trainers. Anyone who is interested, can learn as much as they want to, and then decide to use what works best for them and their dog.