I live in a small town in the Australian 'outback' where I work for the local government ('shire council'). I have personally been using QGIS since around 2010. Since 2015 it has been made our official GIS at work, along with Intramaps, thanks to support from Chartis Technology.
The standard work we use QGIS for include town planning, keeping track of underground pipeworks, (water, sewer, storm water drains), assets, (footpaths and kerbs), rural addressing, land management, (keeping track of which property owners are doing a good job controlling dingos and weeds), flood mapping and all the kinds of GIS work you might expect.
We have also found QGIS useful for a few other kinds of work it may not have even been primarily intended for. The list includes Traffic Management Planning for road work sites, annotating geotagged photos in print composer and using QGIS for a warehouse database for our sign shed.
I would like to add an big thank you to QGIS developers for all the hard work they do making QGIS such a wonderful application, I love QGIS.