YES!!!!! I think it is
so worth it if you like the design aspect of acnl. You dont have to buy items or wait for ordered items to come in the mail. Its hard to make "good-looking" homes when first starting the game, but the more furniture you unlock the better. Also the prompts are really fun, and helped me design different stuff I normally wouldnt do in my acnl house (like a garage, day care, and criminal hideout).
I get ideas from doing these houses and incorporate it into my animal crossing new leaf house. Or if I want to try out a certain room theme, you can always test it in HHD first! This way like I said you dont have to waste bells or time for it to come in the mail.
You can check out some houses ive done on my tumblr (I just posted these recently and I'm really excited about them!)
click me!