Lightroom: Many times while working with a large number of images (any amount for that matter) while viewing using the filmstrip,especially while in the Slideshow or Loupview, but really any module. To very simply have a "HOME" and an "END" key. To very simply take you back to the beginning or the end of the filmstrip. One click, Done! No more scrolling and scrolling ! This would be HUGE!
dj