If you are planning to level a few alts but you don't really feel like spending forever leveling them up the regular way, you can always create a second mail account and recruit-a-friend yourself, upgrade the first stage for I think 20 euro or something (I got it for 8 or something on sale) and then you can level with 300% xp upto level 85 making it a breeze. I advice always having a tank for instant que and spamming instances, it's not odd dinging several times a dungeon. I play tank and healer with this since the dungeons are embaressingly easy and if you are a healer you only have to tab to in order to throw a rejuvenation now and then, then nobody will bicker and try to have you kicked as opposed to if you just had a dps on follow then people might get quite upset and rightfully so.
Anyway, I think it's quite cheap, especially if you can get the discount, just to speed up the leveling process enormously. I'm sure most were aware this option existed but I didn't know it was so cheap. I was under the impression that I would have to buy at least WOTLK and Cataclysm + gametime but nope, works fine with the 1 initial month you get.
Happy leveling!