Hi. Surely its not a question on how many voters there are, but a question on if its practical or not. Not everyone will think of asking for a feature. Most will not for one reason or another.
Programmers, manual writers and so on need this feature. Loading in code/subroutines to a main program (why re-invent whats already done). Lots of programmers have a database of generally used routines that are quickly loaded into a new program code, or writers have descriptions on various subjects ready to load into a new manuals and so on. The list is endless.
As NotePad++ also does programming languages, then, as with many compilers/editors, this feature would be needed, surely?
All the best.