Errors and Omissions Insurance - Is it necessary?

I'm a contract developer and in my 10 years of developing professionally, I've never once heard of a developer getting sued for an error or omission. You hear about other professionals getting sued all the time like realtors, CPAs or attorneys, but never a developer. I've heard of them getting sued for other contractual things (non-competes) but never because a single developer really screwed a system up.

Am I just living in a sheltered world? I'm about to start a contract that does not explicitly require it and all my work will be done pair programming with a FTE developer and all the code is has unit tests. Is it really worth it for me to drop $1000+ for an insurance policy?