I pleased to see this added. I don't see it as a problem at all. Currently all players can see where mobs are located, including the placement of a Notorious Monster. Letting gathering classes see on the map where the various nodes are located is, to me, very similar to making note of where mobs are on the map.

Just because a node appears on the map doesn't mean it has to always be active. Abilities can still be used to determine if an appropriate active node is in range of your character. Just seeing the node on the map doesn't tell you if the node is partially used up or not, or what the node may or may not contain. It just lets you know that it is a spawn point.

This is one of the changes I am very happy about in the upcoming patch.