In previous work we showed that the use of Boolean and other operators in queries to Web search engines has little impact on the quality of the results retrieved. This earlier study used 100 queries containing operators selected from a search engine query log. The operators were removed from the queries, and both query versions (with and without operators) were submitted to three popular search engines. There was no significant difference in number of relevant results retrieved in the top 10 items. At that time, we did not address in detail the reasons for the relatively low impact of the query operators. In this work we revisit the queries used in this earlier study to examine the manner in which the searchers used the operators. For each query, the operator used was classified based upon semantic appropriateness and anticipated impact. Most searchers used query operators in a semantically appropriate manner. This finding suggests that the reason for the relatively low impact of operators on retrieval results was not inappropriate or incorrect use of the operators.