Could you comment on how easily one very familiar with Wilkinson's work and Hadley's ggplot2 might pick up this tool and produce useful visualization? How simil

Could you comment on how easily one very familiar with Wilkinson's work and Hadley's ggplot2 might pick up this tool and produce useful visualization? How similar is the syntax? How does it compare to R's Shiny applications? Is it possible, for example, to update part of a visualization only rather than redraw the whole thing?