Yes and yes! Couldn't contribute that much but I try to
I think having a highly important FOSS project that is not controlled by a company known for shutting down many of its beloved products (I'm talking about you Google) is pretty nice...
Also I think map quality is location-dependent. I live in a large metropolitan area in Southern US; OSM is usable, but there are no house/building numbers, and a good number of businesses are missing. In contrast I think the map is a lot better in Chicago which is a lot more pedestrian-friendly? Also, when I looked at Germany it seems OSM is on-par or better than Google Maps... in fact one of the larger rental websites use OSM instead of Google Maps (imagine Zillow doing it in US lol)