Thank you for the great article and for drawing attention to the fact that Zeitgeist is being pushed down without that much thought about its downsides (i.e. even more collected private data sitting in one's computer) or whether most people actually need that.
The trouble with Zeitgeist (other than being a name that I can't spell
without looking it up :-P) in Ubuntu is that it is too deeply integrated. Without it (<-- notice the 'it' instead of the actual name which requires a copy & paste) the Unity menu won't work. Trying to remove all zeitgeist* related packages will trigger the removal of core packages which I don't want to remove. In short it has become crucial infrastructure. At the same time, it:
1. consumes resources I did rather spare (had to migrate to Lubuntu since the last Ubuntu release).
2. collects a huge amount of information, which I honestly prefer my computer _not_ collecting.
3. has a somewhat not easily discoverable "OFF BUTTON" as it requires installing a non-default package.
It really looks like yet-another-fancy-Linux-desktop-feature whose 'real' benefits are only ever needed or used by a very small amount of people. You really don't need all of that for the Unity menu.
FYI: To turn data collection OFF in Ubuntu install "activity-log-manager", and set data collection to off.