While I'm not quite empathetic of the absurd fanaticism of In-n-Out fans, it's still super easy to enjoy a bite from here as the main flavor is FRESH.
While the drive thru line looks long, don't kid yourself thinking you'll save time by walking in. These guys crank out food as efficiently as possible, but it still takes time.
You really can't go wrong with anything here as there aren't a lot of options. My recommendation is that you eat the fries first; as they are fresh cut, they aren't extra crisp from a double fry, and they're kind of flaccid... so eat them while they're hot as their desirability weakens rapidly.
Fantastic staff, like most In-n-Outs. When in Vegas...