I totally agree with you. Perhaps the time & day of the orientation your library offered are not at a convenient time? Perhaps more advertisements are needed to get the words out to students and faculty members? Perhaps your library can send a few librarians to different classes to advertise for the first 5 min. of the class, you might get a get a bigger crowd that way. That's what the librarians in my university did. I hope these suggestions help.

User education is not a thing to be offered in one day, it is a thing which need Libraries and Librarians to conduct it at least twice a month. This is because , Libraries are doing many activities and have got many rules and guidance on how to use library as well as searching for different materials to facilitate easy access of a document. So giving training through lectures, seminars, study tours and even making a visit to the students classes or to the community in general is a very important thing to do. And the result of this is to make Librarians not so busy as users may search information by themselves. 

Thanks

unfortunately time has changed and with this inevitable changes one needs to be very cautious on approaching what types of presentation required to give and what is your goal?i.e,to give libraries the sounds,touch,feels with a think tank out of the box innovativity