Back when I was working construction and actually using lanyards, I usually tied them in one of two places.
When I was working in manholes, and drainage systems I'd often have it tied around my wrist because #1 I did NOT want to stick my hand down in the "goop" that's often in the bottom of those things to retrieve a knife. and #2 I'm a fairly broad fella, and often times would have a hard time bending and moving in such limited areas period.
When crawling around underneath buildings I'd often tie the lanyard around my neck, cause it was much less awkward to reach it that way than if it were in any of my pockets. The two knives I did this with were primarily a Swiss Adventurer and a Tops Scalpel. (learned to leave the Chris Reeves and so forth at home fairly early on)
Oh, and when I worked Security at the Native Hospital I just kept a small pink lanyard on my MT UDT cuz it made it look much friendlier, and gave me very quick access from my shirt pocket.