Genuine question not snarky. I have even read yahoo's fast website tricks - it's all really hacks and tricks, nothing mind blowing.
What I mean is given some extra time most people can figure things out by some googling and trial and error. This is unlike wolf 3d. Unless you spend considerable time understaning math and graphics you cannot do it.
Scaling a website with exponential growth is very difficult. Fix one problem, two more pop up. It never ends. Oops just spent 50k on SSD's to find out it was a load balancer issue.
Comparing this to wolf3d is comparing apples to oranges as scaling DropBox and implementing wolf3d are entirely different problem domains . But I would say that wolf3d is a much easier problem that's solved by just one man (John Carmack), while DropBox requires tons of resources and hundreds of people with different skill-sets.