When I go to post a photo here, I generally do these exact keystrokes
(no mousing about, though I could if I wanted to):

Code:

xv reallybigphoto.cr2
<<s
<Alt-S>
<enter>
<Control-S>
(edit the filename to suit)
<enter>
<enter>
q

That sequence, which can also be done entirely as hunt-point-and-click with a mouse, imports the raw file, resizes the photo, smooths out the noise, sharpens the result slightly, and saves it as a JPG. Same sequence works regardless of the original file format. Takes (far) less than 10 seconds normally.

Not bad for something from the early 1990s, and it's still the best lightweight thing out there today.