There was a thread like this in the New Leaf Forum, but it belongs here, so I'll totally accept to this! XD
You know you've played too much New Leaf when you go to the bank, see you have $100,000, and say, "Man, I'm poor!" I stole that from the original thread...sorry to whoever posted it first. Credit?
You know you've played too much Animal Crossing when you see a bug and you say out loud, "Where's my silver net?" You check your pockets and start running away to go back to your dresser and get your net.