I have a similar use case, although I am not a power user.

I use it to open often giant .csv and .txt very very fast. I use it to quickly edit SQL because the select-lines command (ctrl+alt+up/down) makes batch edits of indented code a breeze. I use it to sometimes format and arrange weirdly formatted C#. I use it often for its lightning fast search and replace function.

It has grown on me over NP++ which is still a very very nice text editor.