Toddlers made all the difference for me. I was getting rather bored with Sims 3, but without toddlers, Sims 4 didn't hold my interest. With the toddler patch and Parenthood pack, the game is as immersive as any of the previous iterations (and I started with The Sims back in 2000). The kid- and teen-parent interactions are much improved, and I like having various traits that kids and teens can work toward. Also, kids and teens are much more interesting now that they don't come home from school miserable, with homework that takes forever and makes them even more miserable.
I don't mind not having to order things - half the time, trying to catch the delivery guy was a challenge in itself. I don't know how many times my order wasn't delivered because I couldn't get my Sim to the door in time. I'm more bothered by the disappearing diapers, actually.