/use 13
/use 14

Thats at the top of every macro I have other than follow, eat and drink. along with any other ability like presence of mind, arcane power, Natures swiftness, etc. if the class or race has a special ability, I use it. Better to use it every 2-3 min than never use it at all. Saving it for a 'clutch' time just means you will forget to use it because your cluching and I cant think of a situation where I wiped that would have been prevented by a trinket that was on cooldown. When it comes to a boss that I NEED (more like want) that stuff for. I wait the 1-180 seconds it takes for the cool down to expire.

if it takes you an hour to clear an instance would you rather use your trinkets 30 times, or just 2 or 3 times because of a boss or never because your waiting for that moment when you know your gonna wipe and by then its too late.