I'd be scared of it automatically downloading inappropriate or even worse illegal stuff from the search results. Try explaining to the boss you did not visit that nsfw site but it merely turned up in your search results.
This is a good point. It's not just the "used in a court of law" or "national security" instances where this is dangerous. Corporations don't have to follow any formal legal process. If you're using a proxy or they're otherwise monitoring outbound traffic and you have this feature turned on, it will look like you are visiting inappropriate sites.