EZsearch was the first tool to let you quickly search for open classes AND get their descriptions and pre-requisites through the course catalog. In the first 1/2 and even later, you didn't know what classes were all about. All you had was a course number or a GE category that you needed to satisfy. This quickely linked up the course catalog since that was what most people were referencing when they were registering for classes.
EZsearch was also closed after ITS pulled the Open Class List (See Classwatch). Hundreds of people used EZsearch back in the day... back in the day!