As a frequent traveler to Vegas I have to say that I love the monorail. It's the greatest thing since sliced bread!
Well, I would not go that far, but it does make schlepping back and forth to the convention center a breeze!
$5 per person one way, $12 day pass and $28 for a 3 day pass. The 3 days pass is perfect when staying at one of the strip casinos during a business trip and need to go to a trade show. Much cheaper than taking a cab back and forth each way. No dealing with long cab lines, stifling traffic, slow shuttle buses, walking, etc. The monorail runs constantly and never seems too crowded. Quick and efficient. Ticket kiosks at every stop.
Plus, it's a great way to travel up and down the strip and casino hop. Have you ever tried to walk to the casinos on the strip in the heat? It's an optical illusion, as these things are gigantic and is quite a walk between many of them. Spend the few bucks and go with the monorail instead of putting it in that slot machine!