I think babies are hard, especially if you are getting no sleep. So much of it requires input from you.
But at 18 months or 2, when they are chatting to you, it can be a really fun age. exhausting, but fun. I remember doing all sorts of stuff with my toddlers, baking cakes, making huge railway sets on the floor, etc. In some ways, no timetable, no school runs, can do what you like with the day.
The exhausting part is the sleep and th erelentless early mornings. But then you get an evening which is good.
Also having 2 at the similar stage eg toddlers, or pre-school, and then later, both in primary and so on, works well all through thier lives, as you sort of move up a stage as a family.
I found the hardest age was always from mobile to walking. So about 6/7 months crawling until about 18 months when up and walking and talking, and can understand and respond to you.
Mind you I have teens now. They are exhausting in a whole other way.
I cannot imagine how families do it with teens and toddlers in the same house!