to be blunt, no.
unless you search your computer quite often through large database files or for documents very often, you don't need it. it takes your idle cpu cycles at best, which could be better set to do things like download or virus check. at worst, it slows down computer use. i consider myself a normal student user who writes papers and i have never noticed an improvenment with indexing on, even when i DO need to search. i'm sure it has its uses, but your profile doesn't seem to meet them.