I admire people who can express complex ideas in few words.
I hate those people who hide behind academic jargon. At first it appears they might be saying something profound but when you finally unravel all the ugly language they are saying something self-evident to everybody else!
I think we love great writers (like Henryk Sienkiewicz and many others from all the lands under the sun) for the way they can charm us using this metaphorical language with such an ease. Of course they could tell us the same stories just using the plain language we use everyday... but would it be the same stories then? Reading such a book, even doing it while lying in a bed or sitting at the desk, makes us feel like listening to a beautiful music while sitting in a beautiful garden with a strong scent of exotic flowers.
I must confess that haven't tried to read the book mentioned even though I had an easy access to it in my childhood - it was standing among other works of the author on the shelf in my parents' house. I think that in my country we better remember other works of our great writer and talk too little about other valuable novels he has written. But your opinion intrigued me enough to look for the book soon.
I would like to be able to speak in such a manner... at least at special occasions. Though I think it was rather the privilege of the noble class in the times of Sienkiewicz. They had occasions to practice it and it was demanded from them since their youngest years. Unfortunately my everyday language is confined to short technical terms and communicating with half-words (as we sometimes call it).
Answering to your second question - I always admire the people who can speak in such a 'colorful' metaphorical way, reach in quotes taken from the literature and anecdotes. The more I admire the people who can speak such a way... and know when to restrain from doing that. Because the language should be communicative above all.
And here we are at the third question. Some people try to use the rich form of speaking to hide that they have nothing wise to say. Sometimes it's the way they want to show that the others are not worth speaking in their presence. Too much of metaphors may be a sign of mental disease too...