I’ve tried using it over the years but I never liked it because there was no information. So last night I looked at my local city and there is almost no information at all. I spent a few hours last night adding buildings and restaurants and removing incorrect items. It was actually kind of fun and therapeutic and I plan to do more of it tonight. My girlfriend thinks it’s dumb and I’m wasting my time because Google maps and Apple maps and Bing maps exists but she just doesn’t understand open source.
Edit: Apologies, I just realized this question is not Linux specific.
Use it and love it. I live in the countryside and google just doesn’t bother capturing footpaths. Using OSM (I use OpenMultiMaps for Android) I can see contour maps, much clearer transport maps, footpaths, and pretty much anything else I need. Occasionally the notes people write have been handy too, for example for marking footpaths that are poorly maintained or turb into a swap in rain