Anyone tie loop knots for "finesse" type jig heads like ned rigs, ball heads, and darters? I've been watching alot of Richard Gene who swears by it. 

For crappie, yes - for bass, no. I feel you give up too much in knot strength going that route vs. any benefit gained. 

Surgeon loop knot for fishing jigs straight. If not, dropper loop up about 12” - 18” above the surgeons loop. Add a name your favorite sinker and install on surgeon loop and 1/4 oz jig on dropper. Sort of a drop shot. 

I’d rather have the knot cinched up against the hook to minimize any movement between the line and hook. YMMV

I never use a loop knot.

It changes the action of lures, you have less direct control and your bait won't do exactly as your tip does. It's like a jig vs a carolina rig, although not near that extreme. Both have their time and place,

 

 

(but it's more important for lures that don't sit on the bottom for a long time.) winter fishing with a loop knot and twitching a jig every 30 seconds will have no impact, but stroking a jig or fishing a jig with hops reasonably quickly will notice a difference. Ajing fishing in Japan has jigheads that have 2-3 different line ties to create different actions and movements.