The dictation is used as follows:
In the finder field, I may type in the word "competition" —*however, it can show up dozens of times inside the book/html text so that I would have to press "find" continuously until I ran into it along the way.
And so, what I do instead is that I look at the original index marker from the book and type in words that surround that word —*which I speak into the finder field via dictation. In this way, I can land on the exact page where that reference is located. Saves me time. Some, anyway.
P.S. This particular book is 28 years in the making. A few days spent on an index is not going to make or break my resolve to get the job done.