The first time I played with a Sims toddler in the house, it was a nightmare... with the running and the screaming and in and out of the high chair and diapers and... argh! Kind of reminded me of when my own kid was a toddler actually. :)
The second time, much like once I had some experience in real life with my kid, I had a better idea how to manage the toddler. I figured out how to manage the toddler's needs and how much attention they needs - both from their sim parents and from me as a player. Much like a real toddler, a sim toddler is the center of the household - the center of the world - until they get old enough to manage more things on their own. So once I knew how to deal with them, I enjoyed playing them (and will occasionally get misty eyed remembering the all the times my real life kid was Cute Toddler instead of Nightmare Toddler).
Still, much as in real life I know and love people who confess to never wanting kids, I can understand and support players never wanting to play with sim toddlers. The great thing about the game is you don't have to. You can choose never to have sim kids or to immediately age up the toddler and skip that life stage entirely. Do what's fun for you.