I also like to micromap, I like being able to do a lot of edits and polish on a very small area I can focus on, mainly because once I'm done I can look at the map and see an area that is maximally mapped where there is basically nothing left to add. I've mapped hundreds of individual parking lot spaces before, adding reserved numbers and handicapped, the little flowerbed islands and their trees, fire hydrants and fdc connections on buildings, light poles, foot paths and desire paths, community park benches, grills, pet waste bag dispensers, bike parking, really anything at all I can find an osm wiki page for.

This is usually after I'm done doing sidewalks, crosswalks, tactile paving, and adding missing "access_aisle"s where parking lot kerb cuts connect sidewalks to parking lanes which make a huge difference in walking direction routing.

I'd love to extend my micromapping into some indoor mapping, but learning that seems a bit daunting.

When I'm out and about somewhere I don't have the ability to micromap, I add restroom and air conditioning tags to restaurants and update hours, phone, website, etc.