I think the advantage of the "pretty" words is that they can, in fact, convey additional meaning. It seems to me that people in general used to be have a far richer vocabular at their disposal. This allowed for fantastic nuance in conversation. The careful (but wholly instinctive) choice of words enabled a speaker to express complex thoughts and opinions through intimation and subtext.
Nowadays, sarcasm is frequently employed for a similar purpose, but it's a much blunter tool. Note also the ubiquity of hyperbole: anything that people want to express approval of, no matter how banal or quotidian, is declared to be "incredible", "amazing", "game-changing". If something genuinely amazing comes along, how are we to describe it?