I'm pretty sure I explained what to do if you want to greed. Uptime is basically what Arm's Length/Surecast is used for. It's on the DPS to use their kits to the best of their ability to maximize their DPS, and maintain their uptime. The healer rescuing you is also likely aware of this, and understands that you do 0 DPS if you're on the floor. Using Arm's Length/Surecast for the sole purpose of cheesing a mechanic is not very good use of the skill. I don't do current Savage or Ultimate, but I am not aware of any mechanic where KB prevention is actually needed to survive it. However, some PF and prog strats will employ it to maintain uptime, which can make the difference between a clear and an enrage.
I can understand an argument that having to use Arm's Length prematurely to avoid being rescued is also a poor use of the skill, but understand that greeding puts a healer in a very awkward situation if they don't know what you're up to. As a healer main, I can tell you I have allowed more players to die by hesitating to use rescue than I have killed by actually using the skill. On the receiving end, I have never been killed by Rescue. I also can't count how many times I wish I would have been rescued because I screwed myself somehow during a barrage of mechs, and couldn't be any further away from the safe zone.
Again, you don't lose control of your character. You lose the position your character is currently in. It's not a playstyle, nor does it have the impact during encounters that people make it out to be. The only valid argument most players have is it causes their GCD to drift, and there is no disputing that. However, I can throw out an extended list of how Rescue is beneficial. Trust me, if healers lost Rescue, it would impact them, and take away one of very few engaging aspects to the role that take us away from spamming Glare/Broil/Malefic. You have to keep in mind that I only needed three words to describe the DPS rotation for all three healers.
PvE is a team effort, and it is not in the best interest of the healer to use Rescue maliciously if they want to clear content.