I have a 6 year age gap between mine, and I have to say, it's been alot easier than I ever thought it would be. DD2 is 4 months old now, and we've been lucky to get a good sleeper and a generally very mellow baby - I'm not looking forward to the toddler stage so much though!
It's been made easier as I wasn't able to BF her either - so DH gives me the weekend off, and I get to sleep all night through - it also makes it easier for me to leave her with someone if I need too - haven't done it much though, as I'm keen to make the most of her, whilst she is at this easy stage.
I think I've run out of my hormonal high recently though - so I am getting tired now, and there is less time to rest, as I have to keep on top of things for my DD1 - she obviously needs stuff for school and her dinner every night!
I wouldn't change it for the world - even though I know that there will be hard times - they aren't babies for long, and I think it does get easier around the age of 3.
And ditto on the way DD2 looks at DD1 - she adores her! Always smiles and laughs at her, and I just hope that they can grow up as friends and know that they'll always have each other.....