I spoke to Mike Hurdzan yesterday, and we talked about the amount of elevation change at a couple courses that he did in Florida. Naples National had approximately 14"-15" of change (that's inches, not feet!), and Calusa Pines had somewhere in the neighborhood of 2'. He told me that at Naples National they were severely limited with regard to how much dirt they could move (total of only 350,000 cubic yards). To me, that golf course is an amazing feat considering what they started with and how "little" earth they moved.
A year or two ago I had an IM exchange with Jeff Brauer regarding the inability of most people to estimate elevation change. With the specific instance we were talking about, nearly everyone was off by 100% or more. And I think with bunkers, most people overestimate the depth. I'd be interested if someone could post a "quiz" with pictures that had known elevation changes (or depths for bunkers). I think the results could be eye opening.