A psychiatrist working at Yale University, George Mahl, counted and examined ten speech disfluencies (including the infamous "uh" and "um") with the purpose of measuring a person's anxiety level.  He calculated that, on average, during every 4.4 seconds of spontaneous speech, one disfluency occurs in a person's speaking.   (Source)

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The following is a post that I wrote a week ago for my Rhetorical Theory class. It wasn't intended to fully address the question of "Does language create reality?" but it does touch on that topic:

"I think that Gorgias was right on when he said that "the effect of speech upon the condition of the soul is comparable to the power of drugs over the nature of bodies. For just as different drugs dispel different secretions from the body, and some bring an end to disease and others to life, so also in the case of speeches, some distress, others delight, some cause fear, others make the hearers bold, and some drug and bewitch the soul with a kind of evil persuasion." I don't think this was exceedingly dramatic, but I do think that most of the time, language is just a communicator of a greater reality. IE, I don't think it is reasonable to believe that language creates reality.

Let me use an example to clarify: