That same concept applies to all aspects of your character. While you may have made something work for leveling, you’ll now want to fine-tune it to get the most from your character. You might notice a distinct difference between a level 1 character and a level 60 character, but you’ll also be able to distinguish between a fresh level 60 warrior and a fully-optimized level 60 warrior. The optimized warrior will survive for much longer, and will deal far more DPS!
The vanilla WoW Horde leveling guide you see on this site was originally made back in 2006 by Joana (AKA Mancow, or FuriousPaul). The guides have been tweaked many times over the years to make things "faster". The leveling guides were made because of all the messages I got from people asking me how I was able to level up so quickly on new realms. I was first to level 60 on 7 different realms (3 with Mancow and 4 with Joana), even winning Blizzard's "First to Level 50" contest they held back in 2006.