@Myheadsfullofjam funny you ask that, ie about going back to the baby years - in a weird way everything felt so much more natural than with my eldest, even though it was so long ago. And yet on the other hand there were so many things I'd forgotten, such as weaning etc. I was always looking things up on my phone to check as I couldn't remember what the appropriate stage was for doing something.
I think it's perhaps a little harder because you don't necessarily have that group of mums you may have met in antenatal classes for the first DC, but on the other hand my friends who had had babies a while ago were amazing for supporting me during trips out, meals together etc so that I wasn't overwhelmed and could still socialise a little, both for the eldest one's sake and for mine! DH too got used to us being 'always on' quickly which helped.
The only part I found really hard was when my youngest was a toddler and there would be times I had to attend things for my eldest when my DH was working away ie sports day, school plays, parents afternoon, parents assemblies, playdates where the mums stayed but I didn't know the host that well etc etc Those times were stressful as I had forgotten how quickly toddlers move and how noisy they can sometimes be.
I ended spending lots of those right at the back of a school hall with a magnitude of crayons, paper and raisins to try to keep the youngest quiet!
Definitely enjoyed new motherhood more 9 years down the line - I found being a new mum pretty hard and stressful with my first DC, worried the whole time about everything. With the youngest DC it all felt vaguely familiar but without so much angst because I'd matured so much as a person and seen that I hadn't, in fact, done an absolutely terrible job with my first 
I feel my 2nd DC benefitted so much from that huge gap with me being a wiser, more chilled out parent than I ever was for the 1st DC. I just felt like I knew more about life and happiness generally!