I have never had an issue reading the map, or knowing where to go.
X will always be the first number, which is the line running left to right.
Y will always be the second number, which is the line running top to bottom.
If someone tells you to go to (30,28) then it's 30 across and 28 down...
I don't see the issue with the grid system or mapping being done this way, it's the basis of the X,Y axis and it has never changed that I know of in all of my years.
Both then again I work in game design and I use the XYZ axis a lot, so its just natural for me to think in those terms.
To me this map system is easy, never really thought much about it.
Sorry that you're having issues with it OP, but it's an
easy thing to learn and I don't agree with you that it does need changing.