Terraria is a game that seems to have absurd amounts of content hidden in its recesses. I bought my friends Terraria and we played for a solid month before burnout set in and even though we finally got to the 'final' boss we were tired of playing it.
Like you I am finding myself turning on more games with a quick 'to the point' objective instead of figuring it out by playing. It's just time, age, attention, and general care for the game setting. Games are meant for different people and the point of these Crafting/open ended type of games are to drop in and out whenever the player has the time, patience, or urge to play. No worries if the game doesn't stick to the player!
Thanks for your sharing your revisit!