I don't have kids but I imagine it's kinda like how I feel about my dog. Every day I get annoyed with her because she's really stubborn when I walk her, constantly pulling the leash because she found a used tissue on the ground and wants to eat it. At least every other night she'll start barking at 3 am because she heard a squirrel in the backyard and I have to walk down 2 flights of stairs to tell her to shut up. I complain a lot about her, she costs a lot of money and effort, but then I come home and she's wagging her tail all happy to see me and it's all worth it.

I imagine having kids is like that but on steroids. More stress, more responsibility, more money, but having your toddler smile at you as you put them to bed has to hit like pure crack.