What does this do that nano doesn't?
* Execute commands (edit: to manage the editor settings).
* Support for shortcuts we're all very accustomed to in other software C+S to save, Ctrl+c to copy, Ctrl+v to paste, etc
* Mouse Support
Nano serves it's purpose but sometimes I need something that feels "modern" so I use TextAdept (works on the terminal as well). I might give Micro a try though.
Micro can also easily interface with the system clipboard (Ctrl-c, Ctrl-x, Ctrl-v).