Only 5 buffs/debuffs are displayed on raid members at any given time. Again, I think addons may solve this but this is terrible as a healer.
That wouldn't be THAT bad if there was an option to hide other player's buffs. Everyone has two or more self buffs, plus protect, so it feels hella clunky.

Also, hide buffs with duration times higher than 5/10/15 minutes.