I don't think its really about collecting things, I think that's an aspect of the game people get wrapped up in. Yeah, you can choose to fill your museum or catalog, or create the perfect town/house, but I think you're supposed to have a cute little game that's an escape from real life. I'm glad you're enjoying playing it casually, because I think that's how its meant to be played! Too many people turn the game into a chore, and I may be picky about how my town looks/when moves in, but most days I just run around for 10 minutes or so and say hi to everyone.
That's just my opinion. I've seen a lot of "I don't have time to play anymore" around here, particularly with students (which I am also), and it's so silly. I hope taking it easy continues to work for you, it's a big stress relief for me during long school weeks