Having raided since BWL, and being a raid leader for 3, I used to do the same, particular in the beginning of tier 11.

I realised that it was a huge problem on Magmaw Heroic progress. People simply relied on it, and stopped thinking.

I really, really, REALLY cannot stress this enough: The best thing that ever happened in my raid leader style was to stop calling so many things in detail.

That doesn't mean I don't call things. "Smash". But not "Smash, right side, tanks watch out, get in" etc. I wish I didnt' call Smash at all, but hey.

Healers are often the ones that are happiest to get things called, because they have so much more stress-factors going on (for most fights anyway) than say, dps. But they must never ever rely on someone else to call things.

Example: Back on Chimaeron Heroic, I had a new paladin join to replace an old warhorse of a paladin who just plays like a god, but sadly had to go away for a few months.

He's in charge of a certain part of the raid with the poison goos. Massacre comes along. I'm watching the raid frames, thinking "why isn't xxx being healed up?". He dies. We wipe. When asked why, the healer says he was hoping holy shock would come off cd. Besides /facepalm, you realise the guy doesn't have the boss on focus target and therefore can't see the cast bar. He just knew massacre was coming along, but not quite sure when.

I realise most people probably think this is very basic, and it is. But the more your raid leader calls "smash", "massacre" and such to help the healers, the more likely you are to run into wipes due to healers relying on a call, instead of using information that is quite clear in the ui.