I believe Mel Siff said once that the Bulgarians would do BB step ups on a high box for hamstring work. In fact, some say that they drastically decreased their squat volume over time in favor of heavy step ups. I will look through my files, as there was even an interview with one of the lifters who said this.
Basically, your step up height was determined by the strength of your quads and hams. If your quads were weak, then a lower box was used, if your hams were weak, then a higher box was used. I am not sure of the box height or anything, but they said the average lifter used a height which allowed his upper leg to be parallel to the ground (like most do anyway).
I am a bit skeptical, and so was Mel, but it's an idea nonetheless.
AM, you're right I left out squats and deadlifts...I figured that was obvious

. However, you are correct...it is hard to find a guy who squats and deadlifts 500+ ass to grass with no ham development. Squat, deadlift, a supplementary exercise, maybe two, like RDL and GM, and your hams will grow.