I do agree on that, the questions and words are undoubtly an stimulus input, the words or language used, as well as the concepts expressed, may be associated to particular and personal past experiences, they may have very different emotional charges, which will invariably affect our thought processes.
Now about using words to think, I believe it is rather the other way around, we put words to our thoughts, aloud or mentally, but by the time you utter the first word of a sentence, you already know what you are going to say, and innumerable "thoughts", explicit or implicit, have gone through you mind.