I stayed home with my one DD on a maternity leave that lasted just over a year. Prior to and following this leave period, I've worked full time in a professional job.
I can tell you, the culture shock of being at home with my kid was far greater than any I've experienced at work. I'm in the office between 35 and 40 hours a week, and that's it. Once I'm done, I get to switch off, and don't have to think about my Excel spreadsheets or work-in-progress documents (unless I'm feeling really keen or really behind) until the next business day. If I switch off on a Friday, I get an entire 63-hour break from my dull, yet challenging, office job.
At home every day with my interesting - yet even more challenging - DD, I never got to switch off. Ever. Not through the night, when she wanted to be breastfed every two hours, even at 13 months. Not through the day, either, because she wouldn't nap. Not depsite having a committed and engaged DH who tried valiantly to help, because her intense separation anxiety lasted for several months, and only I would do. Not after introducing solids, because even a 1-minute Ella's or HIPP micro meal took at least a half-hour to feed to her. I don't think I had PND that year, but I was so exhausted so often that I did worry sometimes.
And that's just limiting the perspective to accomplishing day-to-day tasks.
Nobody screeches in my ear at work. Nobody starts and ends conversations with, "How old?" People are even happy to have a good yap with me, regardless of whether my bundle of joy was born the exact same month as theirs.
It was absolutely harder!