Definitely yes. One of my gripes with Terraria is that it has an incredibly clear (and long) progression system; which don't get me wrong, that's great when it comes to the fighting/survival aspect. However, it makes it so that you not only have to hunt for resources to construct things with, but most of these materials are only accessible later in the game. Want to make a house involving Adamantite Beams early in the game? Nope, you can't do that.
Often I give up making fancy structures because the materials you're given with at the start of the game a fairly limited and finding some of them is a chore. A creative mode would be sweet, although if it was ever toggle-able in a survival world it could very easily result in cheating.