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.
As others have mentioned, I really recommend StreetComplete. I used it for my city and it's a nice and helpful way as well to walk around what would otherwise be a boring scenery I've seen too many times.
I do get looks when I walk up and down stairs trying to count the steps though.
Holy hell that's a lot of detail. I've never seen step counts in OSMAnd