@Jon81uk wasn't saying they stopped selling them in 205. He was saying they stopped automatically being non-expiry at that date.
You could pay a premium after that date to make them non-expiry tickets. So your recollection is incorrect, you did pay a premium for them after 2005.
This is from the website FAQs:
Walt Disney World Resort continues to honor all unexpired theme park tickets with remaining admission days.
However, be aware that unless you purchased the No Expiration Option, theme park tickets purchased after 2004 expire 14 days after their first use. While the No Expiration Option is no longer available, if you have previously purchased theme park tickets with the No Expiration Option, your tickets will still be honored.
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