Email has a tendancy to suck you in, leaving you wondering where the last hour went. A ticket system helps keeps you on-task.
The ability to quickly and acurately pull and analize ticket trends is huge when trying to find ways to improve your product or service.
By prioritizing your tickets, you know where to focus your time, which is paramount when you have limited resources.
You will find that some issues are reoccuring, or many customers may have the same issue. A canned response can save the day.
Depending on the issue, you can auto assign tickets, so for instance, IT questions go to the IT guy, removing you as the middle man.
When tickets are systematically answered in an orderly fashion your response times become automatic and quicker.