By resting less and increasing reps, instead of just moving heavy weight from "Point A" to "Point B",you increased intensity and worked the muscles harder as opposed to working tendons,joints,and ligaments.
If you rest less between sets,it`s what Vince Gironda called,"Intensity Of Effort".
For example,if you and I weighed the exact same amount, and had the exact same strength level,did the exact same workout, using the same weights and reps,but it took you two hours to finish,and it only took me 45 minutes,I trained harder than you did even though we did the exact same thing.
Intensity Of Effort = getting the most work done in the shortest possible amount of time.............. which means less rest between sets,no bullshitting,and pinpoint concentration.
In essence what you did was a pure bodybuilding type workout!!