It helps to have models laid out to show the scale and relationships between objects during a major battle sequence in a game. The main problem is that most GMs won't have a suitably large collection of model miniatures for every situation. So you can make do with substitutions. And what do all gamers have handy when playing? Snacks!
This does have its own drawbacks, of course. Some of which might not be anticipated by everyone.
GM: On the plain outside the arena you see a vast army of droids and troop ships.
Yoda: Everyone shoot at the Coke can!
GM: It's a Hardcell-class Techno Union interstellar transport.
Yoda: Now it's a piece of junk!
GM: Okay... Someone get some paper towels.
Padmé: It's okay Annie. If it's not drink-stained, it's not really a proper character sheet.
Mace Windu: Pilot, let me down. I want off this crazy ship.
Yoda: Yeah! You lead the attack on those jam doughnuts—
GM: They're meant to be Geonosian Dreadnoughts.
Yoda: —while I take out the Oreos.
GM: Hailfire Droids.
Yoda: Kabooom! Raarrr!!
Yoda: <crunch> <crunch>
Obi-Wan: That's enough sugar for tonight, Sally.