Even though I generally use vi, I recently discovered a use for pico.

If you open a DOS encoded file in pico and the quit, you will be prompted to save, and if you do, pico will convert the file.

I can quickly make the conversion with vi; or even write a perl oneliner to do the conversion, but the pico trick uses very few keystrokes, so if I'm not doing anything else to the file or in vi already, I pull pico out of my pocket and use it (hopefully noone is watching).