I don't mind group buffs per se - the overreliance of one critical point of time is what annoys me the most.
This makes un-optimized play from new players incredibly punishing and deaths just throws your dps into the gutter even more so.

I've seen that especially in dungeons and alliance raids where you have variance inbetween downtime. Some save buffs for the bosses, others just use it on CD and there's already a whole mess. There's very little chance to get back on track if you miss one of these windows unless you 1-2-3 for 2 WHOLE MINUTES and waste resources.

They thought that would make battle and syncing up buffs braindead but it only did things worse with more punishing deaths and messy casual plays.
I'd rather see them go completely if I really had to choose though or cap the increase at 3-5% the most.