It's a different philosophy (Score 3, Interesting)

The short answer, I suspect, is that it doesn't exist because nobody wants it bad enough to write one, and nobody sees a market big enough to pay someone to write one.

I'm looking at this from a linux user perspective, so I can't speak to Windows or Mac, but probably one of the biggest reasons is philosophical. I use a terminal in order to *avoid* all those gui-based things. If I have a task and want to click on things with my mouse, I'll use an app that does that. I wouldn't double click on the output of an "ls" command because I don't want to reach for a mouse.

Second, a fair amount of terminal typing involves playing stupid regex tricks or more complex commands or writing simple code. I don't know how you would make that work in a gui without turning it into an IDE, and there are those around..

So, you tend to find terminal emulators that extra actions and capabilities, but they mostly are pointed at improving readability (e.g. color text and auto-indent) and the ergonomics of typing. There is one emulator in linux that will provide previews of images and such, called Terminology I think, but I've never bothered to use it. Finally, if one is used to a terminal, then the ergonomics of doing what you suggest would take *more* keystrokes than just typing the command. Double-clicking on output and then choosing something from a drop-down would slow me down. Similarly, I almost never type a full filename, since combinations of wildcards and such make it unnecessary. Most of the time, it's just a couple of characters.

So, I probably wouldn't bother working through the learning curve to use a terminal with gui addons.