If I'm not on healer and greed hard on something or if the healers seems to be the nervous type, I surecast/ Arm's Lengths the mechanic that they'll most likely panic on. But even though I generally now exactly how much I can greed, it's not the end of the world of the healer yoinks me when I was perfectly fine. One GCD lost, I can live with that.
I rather see a healer trying to use their whole toolkit and aim to use even clunky niche skills with a horrible delay well when I would've been fine over simply removing everything that requires some thought and timing. I'm not my character, touch me with Rescue all you like. I approve of every healer that is learning to use it even if it fails or was unnecessary.
And if you see people trolling each other, it's more often than not friends queueing together and having a good laugh. If they got indeed trolled by a stranger it's their responsibility to file a report so the person abusing it gets a strike/ ban but no reason to remove a tool just because someone abused it. Assuming that every death by Rescue was a malicious troll that wanted to annoy strangers just because it suits your argument and you couldn't handle a less than one GCD control loss of your character is quite frankly laughable and negative bias.