I've played on several vanilla private servers and reached max level, both 1x and high rates (ED, Rebirth, Vanillagaming, Valkyrie, SC2). I won't be playing on Kronos if it is not high rates or instant 49 or something because of what I have seen on low rate servers.
While some people may be attracted by the 1x "blizzlike" idea, what people will spend the majority of their time playing is the end game, and without a healthy and active end game community, there's not much reason for people to stick around a few weeks after they've hit 60. No or few battlegrounds alienates the PvPers, raiding guilds are harder to start with a smaller player pool, and have trouble finding new members when it takes people 2 months to go from 1-60 and actually start playing the game. People generally get burnt out if there's no active endgame, and on 1x servers that's very hard to build, or as happened to Emerald Dream's endgame community after several guilds were purged without much reason, to rebuild.
Herb nodes as well only provide enough for a few raiding guilds to exist per server, but that's another discussion.
I don't see why, if you're allowed to choose your leveling (say between 1x and 7x), if 1x players truly outnumber those who want high rates, they can't play at that pace and allow those of us who play for the endgame to get there. If there are enough 1x people they should have no difficulty forming Deadmines groups or playing their boar killing simulator, without having to drag down people who don't want to spend 2 months killing X number of Y and running between zones for 1/20th of a level.
I can breakdown how I'll level my NE hunter if it was 1x rates because I've done it so much:
1-9 quest in Teldrassil
9-10 grind, do hunter quest, spend 2 hours running to Westfall
10-16 do grinding quests in Westfall, defias chain etc
17-22 Redridge grinding quests, maybe run Stockades
22-29, run back and forth killing X number of Y for Duskwood quests
29-36 northern STV and hunter chain kill X number of Y quests
36-40 grind Swamp Jaguars in Swamp of Sorrows for mount money
40-42 Booty Bay quests to grind naga/bloodsail
43-45 Tanaris quests to grind wastewander bandits/bugs/pirates
46-48 grind random shit in Tanaris because there are no more quests this level for alliance and Uldaman takes forever to get to
49-51 Blasted Lands grinding quests then Ungoro, run around and collect stuff, grind dinos for quests
52-54 Western Plaguelands, grind undead for AD quests, grind some more
55-60 Winterspring/EPL quests, run BRD 10,000 times until 60
I just don't want to play another boar killing simulator. I won't be rolling on Kronos if I'm forced to level 1x again.