I'm not trying to offend or be rude, but if you can't see the value of CodeIgniter after reading the documentation (user guide), then you may not have worked with enough PHP to see what CodeIgniter does for you. In the case of routing, input, output, any library, or any helper, you should see time saving shortcuts, and if you dig through the code you'll find that you may not be aware of security issues that existed. CodeIgniter will help you make a website that is more secure, and help you do it faster.
My questions to you are:
1) What is your experience with OOP and PHP?
2) Have you read the documentation (user guide)?
