personally i feel that people who don't find it beneficial don't put PDA's to their full use. I used mine in grad school as a mini laptop by buying the fold out keyboard which is basically just a bit bigger than the palm itself when folded and opens to full size.
there are programs to keep track of your grades, assignments, due dates, GPA, etc, etc. if you take time to learn it you will see that there are so many uses for it. i store my workout information on it, my contact lists, i can write email on it and send it later when i sync (don't have a wireless internet model), work on word documents, excel spreadsheets.
of course if you're not inclined to use one then don't bother but if you ENJOY technology and want to carry less (ditch the laptop, leave the books at home) then it's a really nice tool to have. i am the super anal super organized type so i like to have the alarms and gobs of information at my fingertips so i can't imagine not having one.