At the end of TBC, I was a warlock and pvping alot and fought this resto shaman in my guild for like an hour in a duel. I could never drain him out of mana because of water shield. Eventually, I feared him out of range of the duel and really loved the class after that point. So when my friends rerolled alliance and moved their old mains over, I started over as a shaman.
Mechanic wise, I thought heroism was amazing for 5 mans, and it was so powerful for raids, I thought only shaman would ever bring it. I hated dispel mechanics so I loved cleansing totem. Having been a warlock, I had a strong respect for tremor and how powerful it was...it made you nearly immune to fear if it was left unchecked. Grounding totem was so a short cool down back then that I found it amazingly great for both pvp and pve. I really liked how chain heal was a smart heal too. I had healed in the original game on my druid and I realized how bad hots could be in terms of over heal. The idea of being the guy on the raids that everyone wanted to group with because of unique buffs like windfury totem was really appealing (I had a softspot for shaman and enchanters back in EQ1 for the same reasons). Sadly, when I began alot of the buffs were given out and uniqueness was homogenized.
But I persisted on as the shaman and I started thinking of myself as a shaman more and more than even my druid, mage, and lock, all that had been my main in the first two expansions. Even after raiding on other characters instead of my shaman, it is hard to think of anyone else holding such a spot in my heart, even though I admit it is irrational.