If riding just to see the view - I guess not. If riding to go faster, get fitter then I can think of some:
For parents to lurk at
For coaches to see
To compare to prior rides on the same segment and see if there is improvement
To see where things went wrong/good on a segment
To confirm how you felt, how the ride looked
To know how far you went - then
To know how fast you went
To see relative ability
To KOM hunt
To brag about

FWIW - I don't use it. I'm a lurking parent of a kid that does.