I use plain text almost exclusively but manipulate it a lot. One thing I have not been able to do easily in UE (just upgraded to V15) is to select a block of text and insert strings of characters before and after the text block -- I'm actually building commands to execute. I collect lines of text, then need to add prefixes and suffixes, then recopy the block and paste the lines into another program as commands. The 'raw' lines of text collected are not necessarily the same length so using column mode would work sometimes but not always.
The most endearing trait of the editor I've been using is the very friendly pop-up box (via keyboard shortcut) that lets me insert text, numbers, or bullets into all or any lines, and text before or after any (selected) line, and will also skip whitespace, 'xx' number of characters, and/or empty lines. I wouldn't have come back to UE except the editor lost some data due to a bug that is not fixed yet. I'll try to attach a .jpg of the pop-up box.
Can UE do something similar?