Toby Lewin has recently shared his personal utility script that can upgrade the Maya Node Editor.
Personal utility script to add a little more functionality to the Maya Node Editor. The script adds a list of all the existing Shaders/Textures/Utility nodes in the scene for quick and efficient access within the Node Editor.
There’s also a tool to rename shader networks. It renames the selected shader and automatically renames all connected file nodes with the correct suffix depending on their connection (eg myShader_glossiness)
Installation: Just copy and paste the python script into a Maya Script Editor Python tab.
You can get more details on the script here.