I'm the same, in that I can remember all (or most of) the matches of PPVs from years ago but can probably only remember the main events of events 2004 onwards.
It might be a case of, as much as they complain about wrestling, people really do want to enjoy it because they know that done right, wrestling can be brilliant, and it can be hard to just drop something you've watched (or at least, kept up with) every week for years.