To be honest, i wasn't really using hot aggro as a source of aggro, more to keep the main tank hot'd during big fights. Yes, it did help out but it wasn't my source of aggro. If i needed to keep secondary aggro, i used divine stun or 55 blind, or even an aoe blind to maintain secondary aggro. In other situations, I used aoe blind and aoe stun for aggro. There was only one fight that i felt that i needed to use hots to get aggro, and even then, its because nothing else worked.
I personally would like to see more aoe aggro at lower levels. seeing now since ghots are now null for aggro, lower level paladins have almost nil way to get aoe aggro. And those lower level aggro spells can be on the same recast timer as the higher level ones, so they don't give paladins even more of an advantage on aoe aggro.