If you are expecting, be sure to check out Joanna Goddard's Registration Must Haves.
Being a little bit of a low maintenance mom myself, I think some items are not a requirement:
Baby Monitor - only really needed for a large house, we can hear any rustling,crying etc from anywhere in our home!
Breast feeding pillow - breastfeeding is fairly easy once you get the hang of it, regular pillows work too ;)
Absolute neccessities include:
The thin, soft blankets she suggests (especially love the Aiden + Anais ones)
Swaddlers - some babies just love a swaddle and if yours is one of them, this will be a lifesaver!
Noise machine - the Sleepy Sheep is our best friend!