Kedrin is right regarding buffs and how boringly horrible they are to do.
As far as what would be done with the actual buff spells, I don't really have a suggestion. I guess you could make dying while buffed remove the infinite duration of the buff but not immediately remove the buff, so you'll eventually need to recast it on yourself, other than that I'm not sure.
If you think about it the creators and staff of SoD have done everything they can to get rid of stupid time sinks.
-No corpse runs
-No XP loss on death
-Ability to buy off XP Debt
-Vendors pay decent amounts for loot to save forever auctioning things
-MoP (I know EQ had something similar later on)
-Listsold system.
All of these things fix stupid parts of EQ (that existed at least when I played live) but yet Shards clings to the archaic waste of 45 minute buffing system.
I never ever ever XP without at least Emp, JB, Raego, Focus and SV. That's 4 toons that need to be loaded at a minimum. If my group is 3 people all boxing, then we have to juggle toons in and out and it's a pain. If I had 2 hours to play when I logged on and I spent 15 minutes forming a group, 30 minutes buffing said group and 10 or so minutes running to the dungeon I want to XP in, I just lost half my playtime doing chores.
Sorry for the jumbled post, I'm at work and distracted