There is nothing you can hear, as a mum of toddlers / babies, that will explain, truly, what parenting teens is like. In the same way you can't really imagine what it's like having a baby, until you're in the situation.
You say you aren't being provocative, but I think you know you are, at least a little.
It's completely individual, as so much about having children is.
For some people, teenagers are much more tiring than small DC; me, for example.
I have 3 DC, now 16,14,12, and I've been a single f/t working parent since the youngest was a baby. Limited support. I found the baby & toddler years fine, averagely tiring but my DC were decent sleepers, and I am someone who doesn't need loads of sleep.
In my 40s, my body clock has shifted - I get up at 515 to exercise, I am ready for bed at 830 but my DC are very very busy with sports & activities so I am on the road every night, then it is hassling them to eat / shower / get ready. I am shattered.
My DC are broadly good kids but still; there is always something, an emotional upset, row, friendship issue, something at school. They fight, they are grumpy, they've days where they're rude. It's utterly draining.
It's still a lovely stage, as all are - seeing them begin to grow into their adult selves, they are funny & vulnerable.
I wouldn't say it's harder than having toddlers, or more tiring, for everyone. I would say for me, financially, practically, physically and emotionally, in the circumstances I'm in as a single parent, it's utterly exhausting & much harder than when they were small.