I have mostly encountered box and whisker plots in research articles, not often in dashboards. I don’t think they are easy to understand and to communicate data to a public audience. It requires the audience to have an understanding of several statistical terms and know what their interpretation are. I think they usually require more interpretation than the concise data summaries that are usually communicated in dashboards.
However, I frequently encounter histograms. Epi curve, the graph of disease onset during an outbreak, is usually a histogram. They can work well for communicating counts over time.