Just came across this about 15mins ago, and I'm amazed (at the precision), flabbergasted (at the ease) and downright envious (that I've failed to come across such an amazing thing). I never would have thought that, so easily, all these enemies could be disposed of. Have a look and see, it's great!
One of DicemanX's work? A bloody genius. There's also the extreme ecto farm, all biome farm. And the farm with the highest income of 55platinum/hour. Plus various others.
He really is, I've just finished watching a few more of his videos, and it impresses me to the level of the people who made a working computer/TV in Minecraft.
Okay, rigging a bunch of teleporters on timers so the player can continuously move even while AFK may be one of the cleverest ideas I've ever seen a Terrarian come up with.
Right? I might try a few of these ideas when I get some time. I've been lax in my collection of Honey in any map as well, I should really get onto that with the buff it grants, as well as Heart Statues and Heart Lanterns (maybe even using a Campfire to stack the buffs).
One of the best things though, all of his farms/arenas are aesthetically pleasing as well as functional and efficient.
I've noticed that as well; I can't imagine how much time he's put into not only wringing out any problems or inefficiencies with the design, but also factoring in aesthetics. Truly works of art in more than one sense.