If Blizzard don't change their mind about using the modern API there will be all sorts of addons and conditionals that will be available that weren't in vanilla proper. Weakauras, player debuffs, /focus, [nochanneling], /castsequence -- as well as the ability to target GTAE skills using @player and @cursor.
It will slow you down in terms of splitting your XP per kill kill further and increasing the time it takes to complete some quests. However, it'll also speed up your leveling a fair bit having access to free food and water and being able to teleport between cities. A lot of classic quest chains have ridiculous travel times between zones and even across continents.
Unless you just want to play a priest, shaman or paladin will provide far more useful buffs for your warrior.
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