It really does get harder. Babies are not really that hard. They're a lot of work, but each individual thing you have to do is easy. Annoying or gross, sure, sometimes. But changing a diaper takes about a minute. Night time can be tough at first but if you do a good job with sleep training it gets better pretty quickly. My wife breastfed, so most mid-sleep wakeups just become "go grab the baby and hook him onto Mom, make sure everyone has what they need, and go lay back down."
My sons are 8 and 6 now and that's much more difficult on some ways. They're 'people' enough that you can reason with them sometimes, but also sometimes they get trapped in completely ridiculous loops of illogic and emotion and you just have to ride it out while trying to remain calm. There's all kinds of dramas, illnesses, places to go, one thing after another.
Mostly though, being a dad is great, and I recommend it. I meet lots of folks my age who seem kinda directionless, like they can't figure out what's missing, and I think for many of them, family is that missing piece.
I've also met many DINKs who seem like they're having the time of their lives, so YMMV. I don't want to tell anyone how to live their life.
But there does seem to me to be a cultural knee-jerk ruling out of family among my generation that puzzles and saddens me. Everyone seems to think there are a million qualifications they have to meet before becoming a parent. "We need to have a house, and 100k in savings, etc etc etc." And yes, it's good to be prepared. But also, as long as you're a semi functional human, you'll make it work.
If you think you want to have children, you should!