I really do think that having a baby is just something you can't prepare for until it happens. I remember it coming as such a shock that my life was turned totally upside down but this little thing so much so that I barely recognised it!
I think alot depends on what LO is like. Aisling never had a great latch so breastfeeding took between 45-60 minutes at a time unlike 20 minutes for everyone else I knew. Then she'd only sleep on my lap and I hadn't discovered a decent sling so I'd be sitting on the sofa for yet another hour. Couldn't sleep myself because she wanted me to jiggle my legs the whole time!
For me, the main thing even with an older baby is that if you add up all the moments in the day that LO doesn't need your attention then yes, you actually have quite alot of time. BUT all of that time is broken up into 5 minutes here, 10 minutes there so not enough time to get anything real done. It's just a bit of firefighting to get the house looking good but I can't tell you the number of times when I'd finally got her off to sleep in her cot, gone to the loo, changed into workout gear, put the workout dvd on, got 5 minutes into it and she's awake - repeat for every other task you want to get done in a day!
One thing that really annoyed me when I was pregnant though was 'sleep now, it's the last chance you'll get' - it came across to me as incredibly patronising. Even if it's true, why basically say to someone 'haha your life is about to get worse'?!
And for some, like me, sleeping was impossible anyway. I had SPD, was absolutely exhausted but couldn't find a position to sleep in which didn't cause me huge amounts of pain - my body most definitely wanted to sleep but I was in too much pain to do it. I wanted to punch people who said 'sleep now, it's the last chance you'll get' and I've vowed never to say it to a pregnant lady myself!