I've liked everything notch has done. I've been around since the game turned Alpha, and half the fun has been to watch the game get developed into what it is now. I remember being SOOOOO excited when I heard he was adding Hell to minecraft, and amused that he changed it to Nether to be less offensive.
I'm excited to see what he does with "The End" realm. As it stands now, it reminds me of Dwarf Fortress's Hell, lots of nasty mobs, deadly flying mobs, and absolutely NOTHING of value to be found. The only reason to go there is to see just how long you can survive. I would like to see "The End" have a way to escape back to the normal world aside from death, perhaps add a block that is only found on the underside of the floating island in the realm, so it's really hard to get, and you can make a portal back to the normal world with those blocks.