Macro "shouts" slowing skills down?

For instance, putting rush on a macro is actually quite useful. If you press rush in the air, nothing will happen. If you set a macro with rush on it, rush will activate on the instant you hit the ground.

I put meteo on a macro a while ago because it seemed faster that way. Sometimes, when I press meteo, it doesn't work, but if I press the macro, it'll ALWAYS work. However, this can also work to your disadvantage. Sometimes, if tap meteo twice, even if Meteo isn't done casting, it will cast again before you can do anything, ending in a death for me.