The other good place - If you don't mind not actually running over to DL to see the fireworks - is right in front of the candy store at the "Postcards from California" shop. This is right at the DCA entrance and at the end of the Parade route. You catch it as it curves around the entry plaza Sun Fountain and heads through the backstage gates. You can then turn around and walk/stand immediately under the Golden Gate Bridge (the monorail bridge) just in time to see the higher parts of the 9:25 fireworks shooting off over the train station.
FYI - the Pixar Play Parade starts here and ends by Burger Invasion and this is a good spot to see that one, too. You can actually wrap that one up and then walk casually over to DL and catch the 6:30 PM parade in an excellent seat by the cannons in Town Square. (No one ever sits there at first, because they think it's a curb cut!)
Nancy