Those crazy Endermen, picking and placing blocks around the place. Their antics are cute, but inefficient.
A while ago I made a filter to Drape your creations over the landscape. I called it 'Drape'. One thing it does well is locating the top of the landscape. I have re-used this feature to help our Enderman friends along.
Simply select an area, up to the highest point in the landscape, then run the filter with 'Endermess?' set to checked. Hundreds of virtual Endermen will materialise, swap the blocks around, and then disappear. Like Endermagic!
MCEdit Filters >