would echo a lot of this: sleep deprivation (you never get it back, and yes, it does show in your face), never goes away, loss of spontaneity etc etc. I find the need to provide the domestic support hard (washing, cleaning, bloody cooking - relentless, every day, without fail).
The fact that everything you want to do (even work stuff) involves a set of negotiations (I have a wonderful DP, it's not about that), give and take, constant worry about whether I take DP for granted, whether she gets enough time/space, while I try to balance full-time job with being more than part-time mum.
OTOH: DD's smile when I pick her up from nursery; her funny little quirks as she learns her way around words and the world ('I might get a sled', was today's contribution :) she's 2); my pleasure in what she learns day by day; my curiosity about who she is going to be. I'm also much more chilled about things - although also more stressed in a day to day way, if that makes any sense.
Not mad about the baby bit and it seemed to go on for bloody ever...