On the B744 we use the Fix Page during the cruise to give us a display on the ND of where our nearest two diversion fields are.
It's also handy to find out where other aircraft in the area are heading, just enter one of their reporting points and you can then even use the BRG lines to draw their track.
During arrivals into airports where the descent path gets close to the CTA steps we can draw them in.
When flying a NPA we often use the range arcs to remind us where any height constraints are. Handy with the dynamic arc to check if you'll satisfy the constraint.
But most importantly, we can enter a time that is then displayed with a green circle on the the position along our route where we will be at that time. Used as a reminder to call the other guy/girl back from their break!
Great little tool that page.