2wide,
Your rant is misplaced. No one here thinks that Pump class is a substitute for strength training with heavy weights, and I really don't think that rez is doing Pump because she's afraid of "big muscles." She's doing something different while she's recuperating.
I can't speak for Pump, but the aerobics combined with high-volume weight workouts that I did (The Firm video tapes) for two years introduced me to the importance and benefits of free weights. I belonged to a gym before, but I NEVER used the free weights. When I started doing these tapes, I bought weights. I loved how it felt to lift them. I learned the basics of form. I did lose some fat, increase my endurance and increase my strength. The downside was that the constant OHPs (combined with scanning heavy items as a cashier) hurt one of my rotator cuffs. The other drawback was that the speed of the class and the number of reps make it difficult to increase the weight. I started to do only those tapes that made it easier to 'heavy up.' When I came back to exercising after recuperating from surgery, I did a couple of those tapes again - just to get the old bod moving again, even though I knew I was going to abandon them for heavier lifting.
I outgrew the workouts (unfortunately, months before I realized it), but I don't regret doing them. Definitely heavy lifting would have been more effective, and that's what I'm doing now. But frankly, I don't think that I would have even considered it if I hadn't been introduced to the free weights via these workouts.