As with me you'll rarely see a photograph from me that has been edited. So far the most I've done is a minor rotation to get the horizon on the level. For some reason I'm just not happy with the result if I've had to edit it to achieve it.
I'd like to see you get a perfect, full frame, properly exposed, properly coloured shot of a moving aircraft, at the end of a 420mm zoom lens, though!
With normal pics it's a little easier, and they tend to need little-no editing (usually just a quick level correction).
Have a look at any recently (by recently I mean any pic taken with a digital camera. Film scans may not need to be edited) submitted pic to Airliners.net. I can guarantee you that 99.9999% of the pics will have been edited in some way or another.
I think a better word for it would be 'processing'. Editing would have to involve changing the picture somehow (which is why I don't like to clone out unwanted items in a picture, unless it's a small bird that got into frame, or something).
Check
this thread out, to see the kind of things people do when editing/processing their pics.