This.
Right now, over the time my family was visiting, I got sucked into another game because it seems "more fun" right now. In all honesty, I was getting slightly "bored" of MCSG. I'm recovering from that by playing other things until I lose interest. Then, it will be full on MCSG again. Playing too much of one thing, no matter how fun/awesome, you will eventually get bored. Sadly, the only cure is to get away for a bit, find something else to interest you until you're ready to come back. Luckily, with Minecraft's possibilities, you don't even need to leave Minecraft to find something to interest you - vanilla, tekkit, skyblock, the many, many custom maps out there, redstone, trying out new features in the new snapshot, mods, creative, PvP, economy, parkour, the many different gamemodes like SG, The Walls, Ghostcraft, MCTIMV, MCTF2, Fyregames, MineZ, other customization like texture packs, optifine, shader mods...the possibilities are almost literally endless. That's why, up until now, I had gone 2 years without getting bored of Minecraft in even the slightest, always finding something new to try - beating my earlier record time by a year and three quarters...I've finally tried almost every single popular Minecraft thing going on...I can finally get away.
Next up for me in Minecraft, along with more MCSG, is actually being a part of the creators of these things - I've experienced everything there is to experience, it's time for me to be one of those creative people who created these awesome experiences. I'm learning to code in java right now as best I can, and I've got fraps ready to go for youtube...I've got some ideas in mind I want to try, relating to MCSG...I don't think I'll get bored again any time soon. There is always something you haven't done, after all.