So, the bosses were not harder, the players were just worse And that's all about the mystical classic difficulty. We, meaning the very most of all classic players, were just "idiots". We did not know much about our class, theorycrafting and how to bet a - afterwards very simple - mechanic. Even such bosses as Spine HC are a lot more complex and harder, than four horsemen (or any other boss) ever were. And not alone the bosses were - mechanic-wise - easier, classes were less complex. If the general player had not been so bad these days, we all could lough about someone calling classic "hard".
What I miss most about these good old times? As stated above, the feeling it's new. I loved Warcraft RoC and TFT and the great story behind. And so it was just a sequel for me to RoC/TFT and it felt just new and different, but in opposite to other MMORPGs (such as Lineage II, which I played a bit) very familiar, 'cause I knew many of the characters I met. And yes, even today, sometimes I get this feeling and that's why I still play. I remember the first time I went to Dragonblight shortly after WotLK release. To see Alexstrasza, Nozdormu and watch Ysera dreaming in the emerald dragonshrine was just great. So was the DK introduction questline, although I don't like Tirion got the Ashbringer ^^
But after so many years, these moment become rarer and nothing will be like the first months in classic, discovering this huge, already known, world on my own, meeting characters like Thrall, Sylvanas, the Bronzebards, etc. Good old times will always be good Nonetheless I also like today's World of Warcraft, okay Cata was not was I hoped it would be, but after some great addon like WotLK (storywise), it did not suprised me. I really look forward to MoP as Chen Stormstout and the Pandaren Brewmaster was one of my favorite heroes in TFT, but not alone lorewise, also some of the new mechanics (espacially the new talent trees) and some of the new content (pet battles!!!) are something I'll enjoy.