My experience with WoW was the free self-heal was near-useless and not worth speccing into. Here, we'll have to wait and see, but my other complaint about it is it's just what I need, yet ANOTHER ability on my already full hotbars. /sigh
In addition, Overload does give at least split-second respite while your enemies go flying and have to recollect themselves, physically and mentally. While they're flying, they're not adding to the stuns or damage, which can be significant. a self-heal doesn't affect them at all and they can just stand there or continue chasing you and beating on you.
As a healer, I DO move, both in PvE and PvP. I expect to. I get fidgety when I don't. It's just going to take more time (assuming I survive that long) to clear stun, move out of a group, face them and hit Overload than to simply hit Overload then Force Speed. At that point, I might as well not use it and just hit Force Speed and bolt and pray.
As for Huttball and fire, I can already toss people into it if I line up properly, which I'll have to do with the change anyway.
Again, it's all wait-and-see, but that self-heal's going to have to be serious for me to be happy about the Overload nerf.
Edit- As for Force Speed's snare removal, I think what some people are missing is that it's a specced thing, NOT automatic. I'm not currently specced into it, but it will be something I'll look into once 1.4 drops.