Thanks for the insight.The healing in high-end content is an "Excel Sheet gaming". You just spread your oGCDs so they cover every damage instance. And for early runs, like week 1-2, you throw a GCD shield before every AoE, just to be safe. It is kinda engaging during prog, but the closer you get to the end of the fight, the more boring it becomes, as CDs line up so you already know what tools you will be using in advance. So basically when your Excel sheet is done, all you have to do is to press 1-1-1-1-1 for 90% of the fight.
Raids are designed in such a way now that the points where people fumble the most are usually mechs that either body checks themselves or there is a body check right after, so there is nothing your healing ability can save. Even if you throw the most quickest Raise on the Wild West, the chances that the person will rise in time for the check are really small.
The only content where healers' excessive healing can fix something is casual content. Mechanics rarely work in the "either you all do it or you all will die" way there, the worst you can get is a vuln up stack. So your GCD healing can actually carry people who fumble there. But as was told, if the role is only fun when your teammates are bad at the game - something is wrong with the role.