How many editors do you know that support it?
Can you describe how you use it and why you like it?
I'm not jwiede, but here are my answer to those questions:
Visual Stdio 2015 (and later), Visual Studio Code, Sublime Text, and UltraEdit. I'm sure there are others - it seems to be a feature that has taken hold in the text editor market. People seem to like it.
Personally, it's mostly just eye candy for me, but occasionally the image of the text in a file can actually give a visual cue to where something is. So I personally don't find it a need-to-have, but I could see where some people might.