I worked as a paralegal over the last year. I am not certified, but my employer financed paralegal classes for me. I think it will help give me some perspective, and I know the basic vocab. I think it depends a lot on the type of office. In some offices paralegals are glorified secretaries. I worked in an office where we did everything from discovery, research, judgments, settlement offers, talking to clients & O/C, pleadings, ect.
By no means do I think this will make a huge diff. in my law school performance. If anything I have been told paralegals are often disliked for their "better than" attitude at law school. I plan to leave my ego at the door, and not tell ppl. about it. Granted I only did it for 1 year.