Oh yeah, all of it assumes you've done a progressive amount of touching on these speeds in the weeks leading up to full-fledged "workouts." You also need to remember that workouts at mile race pace really only make you more race-worthy within your established fitness level. By themselves, they don't allow you to dramatically "change fitness levels." Only steady mileage and proper progressive tempo running at the right pace (not forcing it all the time), with some regular inclusion of short strides (maybe some drills) for variety and snappiness and the occasional "hard" overdistance efforts - and then focusing more on the regular race pace stuff - will give you a quantum leap in fitness and performance.
As an example of copying workouts and misusing them, I know of one university track program that changed coaches back in the 1980s and the new guy tried to use those regular Villanova track workouts to the letter. Week after week, it was 10 400s here, 6 400s there. But the new guy only focused on the track workouts and not on baseline fitness. As a result, almost every guy on the team was close to a personal best very early in the indoor season but was either hypertrained (crashed and burned) or injured by the start of the outdoor season. Very few ever ran as fast in their entire time there as they did in their first season, and those who had been on the team prior to the new coach's arrival also got worse. Most of them were piss poor cross-country runners and they battled each year to stay out of the cellar in their conference, whereas they had had a decent team (always in the upper half of the conference) before. Even many of the middle distance runners in the previous regime were okay at cross, but the new middle distance groups averaged, gee, it had to be nearly two minutes slower on 8k/5M courses.
The take-away message is that mile pace workouts by themselves don't make the miler. Of course, 100 miles a week all year with a bunch of tempos and practically no mile pace work won't get you as good at the mile as you could be, either. It's more intertwined than that. These "mile workouts" you see in this thread (or anywhere else) have to be taken in context.