When I play a healer the last thing I want to do is run thru a quest tossing heals like a hireling. In the midst of battle? Sure! But otherwise, No!
When pugging, too many players make zero effort for self-heals and expect other players to hold their hand. If someone can't be bothered to get UMD or pick up cocoon, I find it hard to be bothered to constantly heal and rez them.
The aura helps with that, and doesn't make it my personal obligation to top off every little hit point.
The aura helps low skilled players out far more than raiders or people running end game reaper.
When I use my healer in high reaper, I'm tossing heals. The aura really does little to nothing because I'm not standing in the middle of a bunch of melee while they swing at a vengie or doom. Exalted angel really isn't necessary for these types of groups. It adds little to nothing. I rarely see anyone running exalted angel in high reaper.
When I use my healer in LH pugs, it keeps the puglies alive. As a healer, I don't need it. I can toss heals to myself. It helps out the party. They can run up to me and get heals, and it saves mana.
I don't push raid, so cannot speak about exalted angel in higher reaper raids. But I do know that melee sure isn't using it if they want top dps.
When I solo and use exalted angel, it's nice and helps with harder content, but again ... healing in reaper is so so. And when the healing debuff is gone, a cocoon works pretty darn well. Aura isn't necessary.
At the end of the day, for me, that healing aura is all about helping out other people. It really doesn't help my builds. It's literally something I pick thinking "This will help other players in group," even if I'm not playing a healer. Cocoon does that too.
I'd love to see the change be along the lines of an aura ... that has some type of imbue toggle similar to the imbue toggle in t4 enlightened spirit.
RIP Exalted Angel Tree, I love using this for epic leveling. I don't believe any of my builds can use the proposed version for end-game. It's doubtful I'll ever use this tree again.