Whoever designed the 'Ping abilities to share cooldowns' - Bless You!!!!
Seriously, as a Support Main that likes to make big plays, its SO MUCH easier to tell my allies when I have an ult vs when I do not. If I think a situation is dangerous, and my ult/exhaust is on cooldown, I ping the !#%$ out of the ability to let everyone know that I CANNOT do it.
**This system has singlehandedly made me twice as effective at communication in league, and anyone who isn't using it (80% of the community) are missing out on a HUGE and GAME CHANGING feature that has led me to more success ingame. **
Thanks Riot! <3