It doesn't make sense to use `%>%` in plots IMO because that implies you're going to wrap the lhs in the function denoted in the rhs (as the pipe is treated in dplyr/magrittr).
Take a look at the ggvis syntax here: http://ggvis.rstudio.com/ggvis-basics.html
It would be convenient to adopt one mental model that would be more easily transferable between the two, as well as `ddplyr`, `tidyr`, etc.