You're confusing difficult content with time consuming chores to get ready for the content though. While the chores were very much necessary in Vanilla in order to even attempt to raid, and many many hours had to be spent each week farming and preparing for that, doesn't mean the content was hard or even good by today's standards.
I mean unless, the mindless preparation and farming is what really made Vanilla good for you. Vanilla was 90%+ farming and 10% actually doing content (which was basically only raiding or nothing at all). You are very much correct the prep was very difficult, and I personally think once people remember just how obscenely time consuming it was to just prepare yourself to even attempt to raid today, not to mention hoping that 39 other people had that much time to do it too, will be a bit of a shock for most. I don't think many who played in 2005 can play in 2017. 13 years later, people have more active and demanding jobs, families, many more real life obligations. In 2005 you really had to no life this game in many instance in order to have the time to spend just preparing for the content.