Paladin self buffs (Seals) lasted only 30 seconds, so you had to rebuff continuously :P Or then it was just a nightmare.
People powerleveled in Maraudon, kiting the slow slimes at the start. Gave insane exp, until they got nerfed. Still gives only 40 ish exp this day.
You could kite Volchan from Burning Steppes to Goldshire and let it slaughter people there for a long time. Fun times :P
And let's not forget when Kazzak raided Stormwind.