Are spam filters really that bad? I've had my email address in plain sight for well over a decade - no munging or similar tricks, even using a mailto url - and

Are spam filters really that bad? I've had my email address in plain sight for well over a decade - no munging or similar tricks, even using a mailto url - and my domain is a catchall. Spamassassin plus RBL works just fine for me. My personal gmail is around 8 years old IIRC and similarly I really don't see any spam or false positives there either. What are the people who are so concerned about this problem doing that results in them getting spam that isn't caught by filtering systems?