As somebody who makes maps for a living, I think clusters are overrated (I have had, on multiple occasions, had to talk people out of it). The leaflet extension that gives you a preview of the area covered by the cluster and allows you to click to zoom to the extent of cluster I do feel is a good setup for situations where just putting all the dots down isn't going to give you good information. That being said doesn't work great on mobile.

Also pour one out to google fusion tables which back in the day was the amazing way to get tons of dots onto a map.