I have 4 DC. I found maternity leave both amazing and hard work. DC1 and 3 were very easy babies, DC4 was much clingier but still ok, DC2 was very, very hard indeed.
She had a tongue tie and CMPA that went undiagnosed for a long time. She screamed her head off any time I tried to put her down. You will be amazed at how exhausting it is constantly carrying such a little weight. We did use a sling a lot in the early days, but wearing it constantly is draining in its it's own way, and not easy on the back.
I say she never slept, but of course she did. She slept in a moving car and in very short bursts at night. It was utterly exhausting and very limiting. Getting on top of the CMPA took a long time, and looking back I think a lot of her agitation was to do with her being in pain and discomfort.
The other 3 were nothing like that, but then they weren't dealing with CMPA.
I think in some ways the first few months are the easiest for getting things done. Yes you have very broken sleep, but generally your baby stays where you put it and will, with varying degrees of success, accept being in a sling/pram/cot.
As soon as mine started rolling and trying to crawl and walk that was all they wanted to do. They had no interest in sitting nicely in a highchair while I sipped coffee, or even sitting calmly in a pram as a browsed shops. No. They wanted to move on their own steam and go in their own self-determination direction. They loathed any form of chair/buggy/sling from about 4-6 months onwards.
So yeah. As many have said, it greatly depends on your birth and your baby. I also totally agree with PP who described you looking at the idealised snapshot of a mum in a cafe, when what she is mahbe experiencing is exhaustion, tension and feeling a bit frazzled.
Obviously I didn't find it so traumatic that I didn't go on to have more. I did find it hard work though.