Topic Hijack go!
I've not once had any problems with even PUG healers continuing to Cure me after I've told them not to, despite the fact that I tend to have very little faith in PUGs in general. Like I said, once I've established yellow HP in an EXP party, my HP value very rarely changes after that... Maybe I've just been lucky?
If the HP hits yellow and stays there, it's one thing. It's when the BRD/WHM is constantly flipping to -HP gear and back to yellow because Auto-Regen is messing with their percentages that I get twitchy. Mentally, it's a "why is *that* bar moving?" In meripos, Regen III gets tossed out like candy, but occasionally a timer's down and someone eats a Cure III. But yeah, for PUGs, you sound kinda lucky.
To me it's one of those things that a truly qualified healer should learn to get used to after a while, especially so with BLMs (more BLMs that I encounter use their ring than ones that don't, and they should all be using it). Yellow HP numbers don't catch my eye anymore; I see latent users all over the place, and heck, I grew up on RDM and Converting all over the damn place. Non-white HP that's continuing to decrease by significant chunks? That does.
Let it also be said I don't know a lot of people who rely on Minstrel/Sorceror Ring. I've trained myself, when I see a party of BLMs, to only react to orange. Just something I'm still not overly used to with BRDs, since I almost never get a party with one. I do get to babysit DRKs on zergs a lot, so I've trained myself to react quickly to falling hp.