The start of cata was amazing for healing... what are you talking about abuse... you mean CHALLENGING.
Healing in mops boring, the smart heals are out of control. I quit healing in mop, fall asleep of bordem.
They arnt going to what made cata challenging at the start, which was regen. they are making heals heal for less but your regen should be fine.
Cata was You had small heals that sucked balls but you would have mana for a full fight compared to giant or fast heal that drains your mana, CHALLENGE lol.
Only healing class that really sucks at the start of cata was priests (in heroics), which were unreal in 25 mans so it was a pretty good trade off for them.
They said it would be the same challenge as the easy cata heroics... so if your guilds healers are scared of that then maybe they should go dps...
Other then the healing the rest of the expansion loots pretty good.