Do you collect $200 in Monopoly if you don't ask for it?
Yes, you still collect $200.

From the rulebook:


  Each time a player’s token lands on or passes over GO,
  whether by throwing the dice or drawing a card, the Banker pays
  him/her a $200 salary.


No mention of the player "asking" for the money or anything. It says the Banker pays him, so the Banker pays him.