Scripting a super-fast points plotter for Google Earth

I work a lot with spreadsheet tables of points in the landscape. Each point has a latitude and a longitude, in decimal degrees. If I want to check where particular points are on the map, I could import the whole table into a GIS program and then select the points of interest. But that’s way too slow! Here’s a much faster way, using Google Earth as the quick-and-dirty mapper.