Sitecatalyst/discover should recognise visits from google organic search even if the search term has been removed from the referrer header.
Following the new change from Google (http://googleblog.blogspot.com/2011/10/making-search-more-secure.html), logged in organic search visits show slightly differently in the referrer string, they now include ...&q=&... rather than ...&q=search+term&... . These should still be recognised in the referrer type report as 'search engines', rather than 'other websites' and show up as 'Google' in the search engines report.