Yes, the SURBL blacklists are already being used through spamassassin. Look in the X-spam-Status header for URIBL_*_SURBL rule matches. I don't think they score very high (high risk of false positives on spam-related mail as well as spam) but they help. They match based on domain name, not IP address.
Even if the report e-mails are ignored, the spamvertisement stats page does feed SURBL. Nearly 90% of the spam I've received recently contains SURBL hits, and a large chunk of the remainder either contain no URLs at all or link only to "innocent bystanders".