It’s hard to tell as a World PVPer which resource nodes are PVP only. At just 25% or so, it’s also not a big boost to productivity, because you still have to gather the extra nodes.
One thing which could fix both, highlight PVP nodes and improve productivity, would be to spawn different types of nodes next to non-PVP nodes. For example, spawn some Wilting Sun next to the Sour Bells near Highsteppe, or some obsidian next to grathorpe in some cave. That would be clearer, because the odd nodes would obviously be the PVP nodes, and helpful for crafting, because potions usually require a good variety.