All of the Google Docs icons are really thoughtfully designed, with distinctive silhouettes. Instead of making 5 tiny illegible variations on inserting a row/column/etc, they just use the + symbol. Because the symbol is the same, your eye is then drawn to the differing text on the right.

Some of the Apple ones really are ridiculous, like the ones around window management and copy/pasting. Even blown up to fullscreen size, you wouldn't have a chance of guessing what they do. But at display size, they are just plain illegible. Having them there is just a visual distraction.