Per the title, why is evaluation done using just the Enter key for Macintosh and shift+Enter for Windows?
Okay, I see the Mac keyboard's "Enter" key is actually labeled "Return", so by Enter we mean the numeric keypad Enter.
closed as off-topic by Artes, rcollyer, Sjoerd C. de Vries, Kuba, m_goldberg Apr 28 '14 at 18:35
This question appears to be off-topic. The users who voted to close gave these specific reasons:
Evaluation works the same way on Mac, Linux and Windows.
The main Enter key (called Return on Mac, but found in the same keyboard position) adds a newline.
Shift-Enter (Shift-Return) evaluates the cell.
The Enter key found on the numeric keypad (called Enter on Mac) also evaluates a cell.