Honestly if you're not even going to try something/test it out before complaining about it then why bother even posting about it? You're not giving any constructive criticism, just "I don't like it and it looks dumb because GCDs". That's not really helpful. Waiting to test it in actual raid, then coming here and saying "it doesn't help our HPS because I'm spending too many GCDs on it - here are my logs" would have a lot more validity to it. Right now, you really have nothing to back up what you're saying except speculation. Yes I have played this game for a long time too, yes I understand that GCDs not used for healing might not be optimal, but I'm being open minded in what Blizzard is trying to give us, rather than being whiny before even trying it.
It's the same as saying you hate a food even though you've never tried it. We all have our theories about SH, but let's give it a chance, test it out in a raid, and then come back and talk about what's good and bad.