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.
I’ve been editing OSM for years. (896,339 edits in 3,427 changesets, apparently!) For me, it’s all about the free data. I once got a thank you note from someone who worked for a city with a particularly large municipal park. I’d added almost all the trails to the park and other information, and they’d used it to produce a printed map for the general public. Exactly the kind of thing I’d hoped for!
Personally, I do a lot of dualsport motorcycling and most backcountry maps around here are subpar. I map tons of trails and 2track and put them on the Garmin so I know where I’m going.
OSM is also great in lots of Europe–tons of detail.
JOSM is great.
Someone just recommended Organic Maps for the phone–it’s way snappier than Google Maps, but still not great with finding addresses.