I'd rather we had an opt out too. I never use rescue when healing either. If you stand in the big bad, you learn not to stand in it, and you'll get tossed a rez or a heal after tank privilege. DPS players don't need to be yanked around the platform when they say it's their first time, when they're trying to learn where to stand and/or timing their hits during boss mechanics. And seasoned dps players know how long they have if they are animation locked on landing a hit so they can move themselves. When I see bickering break out because of rescues happening excessively on someone or bickering breaks out, I usually just say, "Screencap battle tab, report, and let a GM figure it out." And that stops it real quick.

Protect or Shell being added back in would be better option, or even a buffed up return of Stoneskin.

Unfortunately, Rescue - in the wrong hands - can too easily be used to troll sprouts or people new to content.