If you are a fan of the "vanilla" experience, and since Blizzard caved and are now producing a classic experience, do you want a lot of the convenience features that the current game has now?
For example,
- Updated player models
- Account wide mounts.
- Achievements in general
- Account wide achievements
- A Mount Tab so the actual mount doesn't take up your bag space
- Higher stack sizes for materials (vanilla it was only 20 max for materials)
- Larger bags (back in vanilla 18 slot bags were the highest you could get)
- Guild banks
- Personal Materials bank
- Mass auto loot (kill 3 mobs, loot only 1 mob and you get the dropped loot from all 3)
- LFD
- Group builder tool
- the list could literally go on and on and on for hundreds of lines, but you get the point
Do you just want the leveling experience to take as long as it did, and the difficulty of the dungeons, world mobs, raid bosses, to be like it was, but you want all the convenience features that have been added to the game?
I would assume you wouldn't want LFD or the Group Builder tool, because you would want to preserve the sense of community that the game had back then. (which those inevitably destroyed along with cross server groups).
For me to even want to go back to a "classic" wow experience, the game would have to have some of the convenience features of today, but the spirit of the game should still be the difficulty, grindy, long quest chain, huge wonderful world I was used to back then. I would still want achievements, because I think fun things popping up on my screen when I accomplish something is cool, I would want the mount tab where you learn mounts rather than them taking up bag space. I would also want all of the graphical updates they have done to the game to remain, including updated player and NPC models.