It's absolutely still worth looking into. The basic game is still good fun for a while, especially if you can find a few friends to play with. And the team at Mojang are still adding new bits to it here and there.
But where it'll really be worth it is looking into the modscene. Both the Technic Pack and Feed the Beast are great modpacks which are constantly being updated and offer a wealth of additions which will massively extend your gametime. Both packs include a number of basic mods such as a minimap, an item recipe tool, power and machinery, and pipes which allow you to transport and sort items automatically once you've built them up.
Perhaps look either of those up (the former is more focused on super high-power late-game tools, while the latter offers the likes of forestry, magic transmutation, and another realm filled with mythical beasts and boss monsters). See if one of them strikes your fancy, because it makes the game a much more worthwhile proposition.
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