(using Blender 2.79b)
Almost invariably, when I watch a video on Cycles material nodes, they have an ability to hit spacebar, then type the name of a node to add that node to the editor. For example, Space+
ramp pops up a Color Ramp node. An example of this is shown below:
Googling told me about a plugin called "Dynamic Context Menu," but that does not allow the desired type-and-select functionality.
To clarify, I can add nodes with Shift+A and hunting through the menus that way; I simply want to have this much more efficient way of accessing them.