I found my first maternity leave awful, mainly.
There's no getting around it, small babies are boring. They eat, sleep, poo, cry, do very little else for months.
On mat leave 1 I found myself 'wandering'...dh was in work, my parents and friends were in work. I would go to town for the sake of it, wander a local park and go on walks...but although I had ds1 with me, I was still 'alone' iyswim.
Mat leave 2 was so, so different, because I also had ds1, who was 2. It was harder...getting ready, going out, with 2 was just so much more of a faff. Dealing with a tantruming toddler and screaming newborn at the same time is not exactly brilliant.
BUT...I also had company. Ds1 chattering away constantly. Walking in the park didn't feel like pointless wandering, alone, with a sleeping newborn who knew no different. It was something to do with ds1, watching him enjoy the walk, pushing him on the swings when ds2 was sleeping in the pram.
I wasn't trying to convince myself at 12.30pm to go and make a sandwich for myself, to eat alone whilst the baby slept, or thinking sometimes that maybe I couldn't be bothered and i'd just wait for dinner. I had to make a decent lunch, for ds1 at least, which meant me too.
Having another child at home with you and a newborn forces you (in a good way) to carry on, to do 'stuff'. It makes it much more enjoyable IMO.