I did a quick poll in 4 chat rooms:
http://chat.stackoverflow.com/transcript/message/11867788#11867788
http://chat.stackoverflow.com/transcript/message/11867799#11867799
http://chat.stackoverflow.com/transcript/message/11867796#11867796
http://chat.stackoverflow.com/transcript/message/11867794#11867794
The response: People tend to agree with me that they would like have the code block fully expanded, or at least with an option to fully expand.
I'd add an "expand" toggle below the code block: