I can't say I've ever been in a situation where a single-use reraise item would be useful for the reasons you listed.
I'm kind of with Lyl on this one, never been in a situation where casting RR instead of using an item was a significant detriment. If I get up from death I usually have a good 600 MP or so when I get up. It's enough for Reraise and all the Raises my weakened recast timers will let me use. On the other hand, if you end up in zombie situations a lot, I could see it being useful. If you die multiple times in a row, you could be getting up with not much MP. Depends on the strategies employed by your LS probably. If they wipe a lot, I could see wanting RR items. Or finding people who don't die so often...
Learn2position? I guess you forgo casting Auspice, Boosts, Barspells, or other 10' radius spells when fighting something that is able to Doom? Nobody else ever pulls hate away from the tank, bringing the mob within range before you can readjust? I sure wouldn't want to bring that kind of WHM to my events. You also fail to recognize that of all the meds you carry with you on WHM, Holy Waters are the only ones that offer a clear and concrete improvement over magic, in that you can use waters much faster than you can cast Cursna (even after the recent update). Being paralyzed/poisoned/whatever sucks and all, but Doom kills you with 100% accuracy, and then everyone else as a result.
If you're getting doomed enough on WHM that you need more than a couple holy waters, I'm sorry but you may want to re-think your approach. If the WHM is spending time spamming holy waters it means they aren't spamming Cursna on the other people who are doomed. Basically you're looking after yourself instead of your group. Yes they should have their own holy waters, but those don't always work.
I absolutely do not
recast Boost/Auspice on mobs with an AOE Doom move unless they get staggered or something, and you shouldn't either. Barspells are quick and you should be able to run in right after a TP move, do it, and get out safely. (How many mobs even have a true AOE Doom move anyway? Not many.)
Even if I didn't have Yagrush, if I was doomed and other people were doomed, I would probably spam Cursna on other people rather than holy waters on myself. WHM being weakened has much less impact than DD being weakened. I'll jump on that grenade for the greater good.
If I'm besieged by links, the only thing an elixir is going to do is waste precious time while actually using it, and then even more when it locks you out of casting for ~5 seconds after it fires; quite possibly the worst thing you could do in that situation.
Vile Elixir has no casting lockout and almost no use time. They're nearly instantaneous. Including the time it takes to locate in your inventory and use, they take you away from casting for about 2 seconds. Considering the only time you'd use one is when you're out of MP anyway and couldn't do anything except rest, I'd say it's a pretty sweet item to have around even if you never need it. Better to have and not need, than to need and not have. I can't remember the last time I used a Vile, probably over a year now, but I still carry one everywhere.