I'd agree with Coogan. Too many young coaches are caught up in that double threshold fad, when in reality 90% of the medals at both the NCAA and pro level are achieved with a little tempo work, 5k/10k repeats, and some 1500/800 repeats, rinse - repeat and throw in a long run and hills here and there.
Sure there is nothing wrong with getting some good work close to your lactate threshold and not overdoing things, but throwing away the tried and true principles of a balanced training program will ultimately only hurt the athlete's development. Interesting that after Coogan's athletes won a gold and bronze at world indoors that the distance world isn't banging down his door to learn of this magic secret like they did with the one Norwegian.
Double threshold in some ways is a short cut for so many. It's actaully easy to do and easy to understand. I see young coaches and athletes that spend too much time worshipping Jakob and the so called "Norwegian method" which in fact wasn't their discovery at all but that's another point. Nevertheless, there are no short cuts and you have to do the hard, leg wobbling work required to compete at the top level. But go ahead and keep doing those double LT's you all and keep getting blitzed over that last 200m!