Learn your emacs shortcuts - ctrl-A, ctrl-E, ctrl-U, ctrl-D.
Not every application is emacs.
Eventually there is an emacs port of every application.
Even of emacs?
PgUp/PgDn are still there, but I never liked them on the sides of the up arrow key. Anyone know if you can Fn-arrow for PgUp/PgDn/Home/End like on the Mac? That's good enough.