In-N-Out only shines in the realm of fast food joints (mcdonald's/burger king/wendy's/jack in the box/etc.) where it most definitely is one of the best (they lightly toast their buns!). Other than that, it only has high tourist appeal because of its cliche` old-fashioned, So-Cal, beach-town, hot-rod, juvenile, drive-thru, hangout styling and simplicity. Thus it's constantly full and crowded with annoying kids/morons no matter where you are.
On topic: I don't usually care about Disneyland at all, but you do need to go to Disneyland if their Halloween setup is in full swing. The Haunted Mansion gets a full Nightmare Before Christmas makeover around this time.
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