Google has just added a new feature to Google Maps to save a set of directions into a My Map! This makes obsolete a popular script on ere
But they have gone a step further! This screenshot probably explains it best
Warning: it seems the ‘Save to My Maps’ overwrites the previous content of a My Map, not append like I would expect
Edit: maybe its only temporally, if it happens to you, try disabling and reenabling the map – see comments.