Not only do I use it to find quotes for uses in papers and things like valedictory addresses, but I've gone through it and just read it for the sheer delight of finding new witticisms, new quips, new works of literature I should be reading . . .
For anyone who has ever or ever will take an English class, this is the best place to start for quotes. For anyone who loves words, this is the best place to start. For anyone who wishes to sound like they've read all these books <grin>, this is the best place to start. When you really want *more*, there's the more specialized dictionaries, like the _Dictionary of Quotes from Shakespeare_ from the same two editors.
Other than that, I can't explain enough what a delight this book has been to me. Maybe some quotes: "Next to the originator of a good sentence is the first quoter of it." Ralph Waldo Emerson, *Compensation*
"Intellect does not gain its full force until it attacks power." Mme de Stael.
"Everything in life is somewhere else, and you get there in a car." E.B. White
And that's only a start . . .