He means not using RM on cooldown because he doesn't see that it can be used again. Also if you (like me) are using Weakauras maybe you are also struggling with the fact that the cooldown gets to 1 and then hangs there (so it looks like RM is perpetually on cooldown (how do I fix this!?)). Anyway, if that is the issue then what you should probably be doing is making it more obvious to yourself when MS procs. By that I mean, you can use a WA Icon with a cooldown but why would you replicate the functionality that default blizz action bars already have built in? Weakauras can do so much more to make it more obvious and THAT is the functionality you need to tap into.
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I haven't tested this but if you are using an icon for your WA try overlaying this:
Code:
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Flashes when it is not off cooldown, throws over a little spell effect to make it obnoxiously obvious and beeps at you to let you know it is off cooldown. If this isn't obvious enough try adding another overlay that sets your screen on fire.