The struggles are different. My DH works long hours so I do the majority of the childcare, cooking, homework etc. I do the breakfast rush, the bedtime routine etc. But if I need him to just be there while I pop to the shops so I don't have to take DC then I can at least on the days he WFH.
On the other hand I have an extra person I have to plan around, when is he WFH, when is he in the office, who is eating at what time each night.
Then there is always the compromise, when we do have a moment because DC is asleep we have to agree on what to put on the TV, or what to do, or go our separate ways to do what we want to, but not too often or what's the point of being a couple. So the free time is never truly your own.
Then there are always the small differences in parenting, again, compromise to ensure that the kids are getting the same message, talking to ensure you are on the same page.
I would not want to be a single parent, I love my family as it is. But I wouldn't say it is easier. When DH is away it doesn't feel any harder, just difference.
The big advantage of parenting as a couple who work well together is emotional support. When DC is ill we are both there to share the worry etc.
And I'm sorry to say that at late primary I still find the involvement very, very full on. Driving to clubs, supervising homework, cooking, keeping clothes washed, keeping on top of the endless diary of school requirements.
Its fun though.