Even deciphering 1000 good lines of code is hard . I work in abap and 95% of my time is going through old ,or very old code written in diffrent programing styles . The rest is usualy writing a one or two lines of code.

I mean going from windows to mac os also needs getting used to beacuse Obviusly they are not the same systems . Each of those has diffrent design philosophy. And out of all linux GUI gnome is the simplest( In my opinion also the best looking one ). And most of the rest also takes very little of getting used to since they are very similar to either windows or MacOS( elementary ).