I worked on fishing boats and climbed mountains. In both places, a loop of strong stuff through the hole in the knife's handle gives the option of "parking" the blade for a moment, without dropping and losing it.
I carry a Gerber Gator II. I'm happy with the edge. I have added a loop/lanyard. I carry the knife in my strong hand pocket, with the lanyard hanging free. If Standing up, it is a simple matter to pull on this string and free the knife.
I read a comment that a lanyard on a fighting knife is a BAD idea. Hmmmm.
Any comments, suggestions / explanations welcomed