My only complaint about the one at MK was that they would not let you in with a stroller which was a problem for me since I had my 3 year old asleep in the stroller and I needed to feed my infant and my husband was across the park with my older son. I didn't know that I wouldn't be allowed inside and they did not want to make any exceptions! Not fun when you have a hungry 3 month old!
If I recall I don't think any of them let you in with a stroller as I left mine parked next to other strollers outside the door.
Here is my take on the Baby Centers-I didn't have any children that were nursing so I didn't peek in the nursing rooms (I don't think):
MK-
Easy to find, centrally located (it is near the First Aid & the Crystal Palace).
I liked the decor too it made me feel like Mary Poppins was taking going to start singing.
There was a little kitchen area, there was a seating area with a TV, high chairs, I want to say books & some toys as well as a kiddie table & chairs.
There was also another room with about 10 give or take changing tables & attached to that was the nursing room & the bathroom which had 2 stalls in, possibly 3.
I liked this one alot.
Epcot
This was my favorite one. It was also easy to find & pretty much centrally located (between the worlds) but I wouldn't go rushing back there to change a baby if I was not in the area since it would most likely be a far walk.
They had a nice toy room with a table/chairs/TV for the kids to relax in.
They had men & women's bathrooms which were huge & clean.
There was the changing area & the kitchen area & off of that were 2 (maybe more, maybe only 1) nursing rooms.
We drank alot of water in here as they had the Poland Spring type water dispenser but it wasn't Poland Spring.
MGM
I was not impressed with this one. The last time I was in it was in 2001 & I didn't bother the last time. So if it has changed someone correct me.
It is small, too small. It is located in the Guest Relations building, literally a door off their main waiting area. There was no one in there to greet you which I thought sucked.
We were probably in there 5-10 min & saw no one come in.
When you walk in to the left is a little alcove to nurse & to the right is the small changing area/kitchen area. That was it.
AK
This one was also nice & we drank the water in here too since AK is hot!
The front room is huge & there is a bathroom or two right there, family type of bathroom. I want to say there is another room towards the front but I am not 100% sure.
Then in the back is the huge changing/kitchen area.
This one isn't centrally located & we hit it on the way to & from the Safari. It was fairly easy to find.
I never bought anything in there since it is over priced & since I am paying an arm & a leg to stay & play there why should Disney get any more of my money at inflated prices. If it were me, I'd bring stuff there/ship it down.
I think the baby centers are great & I wish they would have 2 in each park, well the bigger parks.