I've been re-acclimating to working on a Mac. There are a few differences that annoy me, one of which is hitting Command-K to get to the search box in Safari. This is standard on Firefox and Chrome.
As usual on a Mac there is a solution, but it may take a bit to find the right incantation to get it working.
Open System preferences and select "Keyboard" then "Keyboard Shortcuts".
On the left select "Application Shortcuts" and click the +.
Select "Safari" for application and enter "Google Search..." for the menu title.
Enter Command-K in the shortcut box and you are all set.