If you go into a city, where the majority of commuters will be, that is not typical. There are many more commuters using drop bars than bike trail users (and mountain bikers!), but it is not a majority of them. If you are out in a suburb, where people are commuting longer distances and in lighter travel, then you would probably see more road-bike commuters.

Consider many of the bikes marketed as commuters, such as the Bianchi Milano, Electra Amsterdam, the Trek Urban series, the Gary Fisher Fast City series, the Marin Urban and Commuter bikes, the Giant Metro series, all of the Specialized Multi-Street lines, and more. The vast majority of these bikes do not have drop bars.