I'm short, too, and somehow I always manage to end up behind the person recording the fireworks on their full-size i-Pad/Tablet. Seriously, just go home and search YouTube. There are videos of every nighttime show at Disney since the beginning of time...and many of them are a far better quality that what you're going to end up with on your phone/table while holding it over your head.
That's where all the You Tube videos come from! You may go home and watch the video from that guy in front of you.