In Reply To:
Are you saying big-gear workouts are worthless, or that they should be considered something other than "strength training?"
of course, big-gear workouts 'work'. of course, so do 'small-gear' workouts (surely you remember the school of the thought that suggesting riding at 100RPM all winter, including over rolling hills).
The question is 'do big-gear workouts work better than workouts of similar intensity done in a different gear?'. I certainly haven't seen any evidence to suggest they do, and it certainly hasn't been my personal experience.
I suspect that a lot of people do big-gear workouts at a higher intensity than they would otherwise be riding at on that particular day, then suggest it's some magical property of the bigger gear which is responsible for improvement. I just don't buy it, and I've yet to see someone put forth any compelling reason for me to believe it.