OK, so I'm just as excited about breaking through as @The Engineer and since he has shared so much useful information here, maybe a recounting of my own humble journey could be of use to someone else who loves the bumps but hasn't gotten them dialed in yet.
Like I mentioned above, I began actively seeking out bump runs about 5 years ago. I just find them endlessly fascinating: you can ski the same named run all day long and never ski it exactly the same twice. Groomers just don't hold much interest for me anymore. I had found Lito Tejada-Flores' book and video series very useful in my early days, and have always been a ski school devotee. Taking Lito's bump video and ski school lessons as my template, I endeavored to ski bumps with nice round turns. I progressed to steeper slopes and bigger bumps with a cobbled together technique that I thought worked. Still, in retrospect, I was skiing bumps one bump at a time. There was no flow. In fact, I can best describe my runs as a series of linked recoveries as my skis got launched out of each trough with me along for the ride.
Two years ago I was at Winter Park during a week that coincided with Bob's Bump Jamboree (the one day clinic). Bob was not there, but Greg, my teacher was very capable and it was a great experience. Last year I was there again for the one day clinic, and that time I got Bob. He stressed over and over that basically none of us had our weight forward enough. He asked us "How many times today has your weight been too far back? OK, now: how many times today has your weight been too far forward?" Rhetorical, of course, but instructive. We did some balance drills, including flat 360 spins. Being able to do those drills gave me the false sense that I had it dialed. Wrong. Maybe on a smooth surface. But, again in retrospect, definitely not in the 3D environment of a bump run. A couple of days later I was standing on a bump sucking wind about 2/3 of the way down Outhouse when a woman glided past me linking effortless turns, going as slowly as she wished. Swish, swish, swish. She continued down, hit Mary Jane, and skied out of sight. Same run. Same bumps. She didn't look particularly athletic. And if she was younger than me, it wasn't by much. WTF?? I definitely wasn't yet with the program.
So, this year I scheduled my ski trips to coincide with one of the Bob's Bump Camp sessions (the three day experience). I again got Bob for the first day, then for the second and third days, I had Tom. (Yes, I got demoted to the remedial group) (BTW, Tom's great). During the second day's apres session, we had seen the videos of the day and, over the second or third round of drinks, the crowd had dwindled down to about 10. Bob was holding court and telling stories when out of the blue, he said out loud "You know, there are some people who come to these camps repeatedly, and never change". He might not have been talking about me, but he definitely SPOKE TO ME. I realized that, despite taking to heart several pointers like doing dolphin/backward bicycle pedal movements, Bob's "rub and release" move, hands up, feet together (well, almost), the day's video showed that my basic technique had stayed pretty much the same. What was I missing??
Unfortunately, I had to leave the morning after camp ended. Then, about three weeks later, the first week of March, I was skiing under the Thanes chair in Park City, I experimented with REALLY driving my shins into the boot tongues. Something about the pitch, the bumps and the snow texture all came together to allow me to drive my weight more forward than I had ever tried in big bumps before. BINGO! I distinctly remember the sensation as being a lot like pressing on the brake pedal in a car. I felt like I had complete control of my speed. It wasn't an instant transformation: old habits die hard. But, I was starting to get it in about 30% of my turns. Then 40%. Then more. I had discovered the holy grail. Not like it's not all in Dan's book, which had I read for the fourth time on the airplane home. Not like I hadn't been told what to do repeatedly. Duh.
So then, the following week I was back at Winter Park and I could take the adventure back to familiar territory. After fits and starts, I found that I could do it in the Mary Jane bumps as well. Then, the second to the last day of the week (and my season), I had an epiphany: I COULD SEE THE ZIPPER LINE. I'd never seen it before. I'd never understood what it was. But now, all of a sudden, it became clear that the zipper line is the only reasonable choice. As long as speed is under control.
So, that's it. I'm really bummed that this all came together just in time for my season to be over, but I am reasonably confident that I will not lose it over the summer. I'm not there yet. Not by a long shot. The possibility of my weight falling back and getting launched looms ever large. But, after all these years I can finally see the way forward. Then, maybe at about age 80, like @SkiMangoJazz is shooting for, I'll be able to say "I don't ski the bumps anymore".