First thing I did was try to figure out how old you are. The reason is that CA on lenses is better than it has ever been but almost every lens has some, especially non-telephoto zooms. For instance the 24-105L, 17-40L and 'L-like' 10-22 are almost as bad as the kit 18-55IS (comparing corners on crop to corners on FF though).
In the past (pre-digital) it was less noticeable because a lot was done in B&W and you had to print color quite large to see it. However, now we can pixel-peep it can become much more obvious and in the age of digital 'perfection' it becomes less acceptable.
I now look at old color prints and can immediately see the CA and yes it is annoying. Anyone who does not PP digital images never notices it.
However, if you can still see it on a computer screen (full image, not zoomed) or 'reasonable' sized print (20" or less) after correction, than I would submit that you could probably do better in PP.