User tests: Successful: Unsuccessful:
As Jörn Daub has mentioned in the google group three years ago, the behavior he described still exists in Joomla! 2.x and 3.x. You can read about it here: https://groups.google.com/forum/#!topic/joomlabugsquad/uws63_tvPPw
Since it still won't break anything and there doesn't seem to be a better solution to this, I've added his proposed getData() method to the JForm class and changed any calls of $this->get('Item') in every view class where $this->get('Form'); and $this->get('Item') were used.
This surely doesn't look as good as $this->get('Item') but it solves all problems Jörn mentioned in an unobtrusive way, while any other component would just continue to work just fine.
Tracker item can be found here:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32340&start=0
I will close this as it breaks the build process because of an existing getData() method.