WRT the metro issue, have you tried switching the map into "Transit" view? Hit the information (ⓘ) icon and select "Transit" under map settings. That shows all the transit lines & stops.

As you zoom out, the subway lines do disappear, but are replaced with national rail lines, and then keep zooming out and it shifts to showing major international rail terminals.

It doesn't hide all of the other stuff shown on the map, but it does effectively highlight each transit line, so it's easy to find the closest line and then scan it for nearby stations.