I'll have to disagree with
@DJFlare84, who complains about those who only see one side of the story while... Only seeing one side of the story. //Oh the Chlorophythy!
And you're welcome to do so.
Although personally I'm not complaining about anything. I'm not sure why you had to say it like that...
Of the ~600 hours I spent playing Terraria, about four hundred of them (give or take a hundred) were spent just building or fooling around with no given goal in mind. If you choose to treat Terraria like a game that ends when you're done beating all the somewhat challenging bosses and events, then that's your problem... Some of us actually like building better in Terraria than in Minecraft, a game where you can see what the hell you're doing most of the time and thus is much easier to use as a building game.
I do enjoy building in Terraria as well, although not quite as much as MineCraft.
In fact, all I'm doing right now while I wait for the 1.3 update is pretty much experimenting with building nice-looking houses on my old server map. Boreal Wood is pretty lovely stuff.
But I said CREATIVE side, not Artistic. There's a difference.
MineCraft allows for far more complex and ingenious contraptions with it's redstone dust circuitry and various mechanism blocks. You can literally build a working calculator or a video game INSIDE MineCraft. Plus, the 3D works to it's advantage by giving you additional layers of building space to work with. In comparison, Terraria's workspace is... slightly more limited. Yes, you can see everything going on in your world, but the lack of vision is not a point AGAINST MineCraft, it's more a point against you if you give up entirely because of it...
Anyway, Terraria tends to get old in the building department because there's so little to actually do. You can make a nice house, you can make some pixel art, yes. But you can kinda also do that in MineCraft and THEN some.
You can build a trap in Terraria, yes. But you can build a better one in MineCraft. And once again, the 3D works to it's advantage.
About the only thing Terraria does better in terms of it's wiring is the actual wiring. Redstone dust can be a pain to try and get everything running the way you want it. You really have to abuse those extra dimensions, but in the end, MineCraft just has a greater variety of far more interesting mechanisms.
If you're not into that stuff, then by all means, stay with Terraria. I'm not trying to tell you MineCraft is better. I AM trying to tell you it's better for building stuff, though. You're welcome to disagree, of course, just know that you disagree with no chance of swaying me.