You'd want a priority list which looks something like BlockNoDuration-Personal-Nonpersonal which is "all but buffs with no duration". While it can be bothersome to have buffs like mount or "ancient mana", i'd suggest making a list of things you want to see because some enemy buffs with no duration are quite important (bolster? enrages?) and you don't want to list them all 1by1. I've found a good balance filtering for Blacklist-TurtleBuffs-PlayerBuffs in party frame, Blacklist-Personal-Nonpersonal for target buffs and Blacklist-Personal-RaidDebuffs-CCDebuffs-Friend Dispellable for target debuffs