As I've written in another thread, verbal and non-verbal thinking are just two modes of our mind. most of the people can do both. Even if the only time one does verbal thinking is when he writes or speaks, it is there. However it is safe to say that most of thinking happens non-verbally. Otherwise we would be too slow. To speak out every solution to every problem word by word would take too much time. People are used to be conscious about the internal dialogue in their heads and even learn to dislike it for obscuring the real thinking happening at the back of their heads. It is similar to disliking a person who talks in the movie theater. So a lot of PD is about shutting up that annoying guy.
Some people are blessed with non-verbal thinking, which usually means that the voice in their head is not noticeable or absent.
This can help with the skills where non-verbal thinking is important. For example it is often claimed that talented people and geniuses heavily rely on visual thinking. This may not be their only advantage, but it surely helps.
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