I used it to map out storage locations and refill stations at our online grocery picking stations, then export it to read in using geopandas in order to calculate the shortest distances between all locations!

I used it to write papers about glaciovolcanism early in my career. Later, I used it to study caves on the Moon.

I used it to examine results of objects a model detected out of an aerial images

Make maps of distant relatives' locations for a genealogy project

Viewing a GPX file that I also view on Osmand (Android). QGIS can be configured to display the POI colors by `type` ("restaurant" is red, etc). Combined with a handrolled script which adds Osmand's non-standard markup, I am granted the superpower of... being able to distinguish between points on both mobile and desktop.

I work with and contribute to a QGIS plugin that manage water and sewage network data. Together with PostGIS, it's a powerful tool.

https://github.com/giswater

I've used it for gixapixel scale rendering projects. Giant wall murals at 300 DPI.

QGIS is incredibly powerful.

all the forests i managed have a complete qgis cartography: species plots, age plots, density/volume, etc. also i produce maps for the workers to get to the spot i need them to do stuff: log, make a road, plant treelings, survey a pond, whatever.