Have a look at what's in the latest Java update:
Java for OS X 2012-004 delivers improved security, reliability, and compatibility by updating Java SE 6 to 1.6.0_33.
This update configures the Java plug-in to deactivate when no applets are run for an extended period of time. If the prior update named "Java for OS X 2012-003" was not installed, this update will disable the Java web plug-in immediately. Java applets may be re-enabled by clicking the region labeled "Inactive plug-in" on a web page.
So now it's not just in Chrome, but in every browser on Mac OS you must click the applet and do additional work to get it going.