Thing is that's exactly what they DON'T want, they're going to mess around with regen and manapool/spellcost ratio's specifically so you can't just sit there spamming your biggest heal. The change to health/boss damage to make bosses not just oneshot everyone is to bring back the 'Triage' element of old school raiding, where it wasn't a case of 'keep everyone topped up or they'll get insta-gibbed' but 'okay, he can probably take one more hit, so I'll chuck a little heal to top up his mate, then drop a slightly larger heal on that other guy, oops, I forgot the tank, big emergancy heal on him, spot heal on OT' etc. a case of prioritising who need what, and using the best of all our heals for the job, not just spamming our biggest heal on everyone, regardless of Overheal, not caring about mana as we know we have enough regen to constantly spam our most expensive spells for like 3days without going Oom.
personally I can't wait
sounds like the game is gunna be getting alot more difficult, healing will require a bit of though and tanking wont just be 969696969696969696 50k AoE threat, lets just hope they do something to make Dps a little more involved.