Thanks for the info!
I'm a Fury btw.
Yes, I'm well aware that if I'm casting something more important (like cure-curse), then I have to wait for it to finish. Or if I'm trying to cure several people in a row, I have to wait for the 0.9 second cast time for each cure. I am already used to that on the click-to-cure buttons, and this change should make the behavior consistent for the click-to-heal buttons, so they will all work the same way.
I have hotkeys and macros for group heals, damage, etc. If I'm clicking on a cure or heal on an individual in the raid window, it's because that person is in trouble and needs curing / healing immediately!