I just completed the final prerequisite for the quests that require getting loads of blocks (The ME quest). Some of them (glacial) look too easy, some (oak wood) are just a matter of setting up a planter/harvester/fertilizer setup, some (soul sand) can be done in a single trip to the nether if you're so inclined, and some...well, here's my reaction to "Cobble gen madness".
"Okay, what's this one? "Cobble gen madness"? Well, I got a cobble generator, this might be simple."
"Hmmm. Only one block? This looks too easy. Let's just see how much is it..."
"FOURTY THREE MILLION? Well, I've got a cobble gen running, maybe this isn't too bad..."
...
...
"Well, looks like I'm gonna be on this one for a long time..."