Enterprise Edition Controller events not firing if Full Page Cache is enabled

Given the nature of the full page caching, I'd call this "works as intended". While it can be a little strange not to have some events firing, they had to pick a line and this one makes sense to me, especially since the controller is never really dispatched.

You should use those controller dispatch events for anything that affects the page (as it still needs to be generated), but if you are using it for tracking and such, no it would not be appropriate.

See here if you want to learn how Caching works with Magento Enterprise

http://magentophp.blogspot.com/2011/02/magento-enterprise-full-page-caching.html