Wrath was around for longer. Extrapolate based on the frequency of boss updates in mists and then corellate that with the length of wrath and you get?
My preference to but yes raids were less important for many more players then they are now where they are singularly important for almost everybody. While it may shock and surprise you end game content for players throughout most of wrath and cata was just running dungeons and not touching raids at all or very sparsely maybe a pug on occcasion.