Try mods. They add scary amounts of content to the game. One tip though: NEVER install TMI, because you end up giving yourself end-game items and it ruins the fun of playing through to discover how awesome they actually are.
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Thoughts? Suggestions? Random acts of petty fanboyish hatred?
Fact is, Minecraft is what you make of it. I've hit the "burnout" before and didn't play it for about 4 months until 1.8 came out. Played the snot out of it again for all the new features and joined a decent server. Now I just casually play day to day. Setting yourself a goal helps a lot, but you probably just need a long break from it.