Today, I rode the skyway (Jacksonville's downtown-only monorail) to a lunch on Jacksonville's South Bank (the south side of downtown). It was actually fairly packed; I saw one or two railcars with four or so people on it- the maximum a car can have with everyone sitting down.
Evidently the common claim that "no one rides the Skyway" is not true.
Of course, this claim is not dissimilar to a common statement about our admittedly anemic transit system: "No one ever rides the [bus/Skyway/whatever]... I look at these buses and they are always empty."
In fact, sometimes they aren't. But even when they are, it doesn't mean what you think it means: buses are constantly loading and unloading people, so if you don't see a ton of people on the bus, maybe some of the passengers have already gotten off, or haven't gotten on yet.
And of course, if the buses were full people would be complaining about how full they are.