I have some really long macros but to be honest I have never faced a problem of finding quickly what I want. I usually have in my head how each of my macros look anyway cause I spent some time thinking about how to create them.
The thing is what would be a key word when searching? Name of action? Doesn't seem ideal when most macros have huge amount of the same action - set variable or ui interaction. Searching in comments of actions/triggers? First you need to start using them
I usually don't. Unless its ui interaction based on X,Y - then I always add that.
Anyway ... It could be useful when we could be looking for action based on variable for exemple when its set variable action for exemple