This year I did the LT (I-AT) at much more precision than ever - more of it and at a higher frequency throughout the week.
I was challenged a year ago to change some of my training to a more intensity based model ("normal distance model"), but luckily I decided to go with what I believe in and to do that even better instead.
Problem is with LT training -when you want it to be really, really potent ; it takes precision ALL THE TIME, it makes the winter training much more boring than with the faster stuff and you got to be very, very patient. The major lift comes when you manage to develop the AT base from the winter into running aerobic at a lactate level where most people run on their anaerobic system (metabolism) in the summer (keeping the triggered fat metabolism, higher concentration of enzymes 5-HAD, Citrate Synthase from the winter etc) This in a real key ; the AT training is only a component needed to develope the high end "aerobic" system. If you do not know how to make this transition when the summer comes you will burn yourself into the anaerobic modus quite fast and not get the results you could have. In that case you might as well have trained normal distance training during the winter. Therefore precision in the summer is equally important. Racing alot will for example help the anaerobic system-guys but not a whole lot those (few) with a real high end aerobic system in the bottom.