I agree with you, TDK6. The absorption requirements of competitive-style bump skiing at high speed are enormous. There are other tactics in bumps that require much less athleticism. But playing with skiing the zipperline smoothly can be helpful for all skiers, regardless of what tactics they prefer. If you can absorb zipperline bumps, you'll have no trouble with the smoother, rounder lines!
And while I agree with your taste for lines and tactics in bumps, I'll make a plug for the other viewpoint. We haven't heard from him for a while, but Dan DiPiro was a strong advocate for skiing--and teaching--zipperline bumps for "mere mortals." He argues that most skiers can, in fact, learn to ski the zipperline and that many of them actually do want to. And the key to his teaching success: absorption. For more on Dan's perspective, search the archives for Dan DiPiro.
I enjoy skiing the zipperline now and then. But I enjoy not having to ski it all the time, too. Options are good!