Now that US Federal government is open, USGS layers are running again. Sorry, these layers are US only. But on the other hand if you can't see the layers, it means you do have a functioning government, so there's that.
Also, user Seafoodbuffet has kindly updated the GmapToGPX bookmarklet to be compliant with the new Google Maps API. Follow instructions from the "Export as GPX" link from the main page. Thanks!