Possible changes to the Dragon regarding timers
So as we all know when the Dragon dies, it lets out a loud sound that lets everyone know that it just died making the dragon timer essentially pointless. But even if we remove the sound it makes it's not hard to see that you opponent just got the dragon buff.
So here's my proposal, first off the sound it makes should only be heard by teams that have vision on the Dragon at the time of the death This way it lets everyone know that the Dragon was just taken but you have to put in some effort to get the time on it
This way it becomes "I'm not sure if they are doing dragon but I'd better ward it before it dies so that we can have the exact respawn time" "Wow, they have 2 dragons already? I'd better keep better ward control over it next time so we can contest it"
Instead of "Oh well we didn't get the dragon, who cares? We know when it will respawn anyway"
The second problem is that everyone can see if your team has the buff just by left-clicking on anyone on your team. If you know that they are doing dragon and the top laner isn't there but is still visible you can wait for the buff to pop up.
My idea for this is that the buff shouldn't be applied until 3/4 members of the enemy team are visible or until 3/4 or more members of the enemy team have been seen after dragon has been slain (not necessarily all at once) unless your team had vision at the time of the death
Since most of the time the enemy team will go back to the fountain then go back to their lanes after getting the first dragon buff nothing will change the only difference is that the team that didn't have vision will have a harder time pinpointing when the dragon died
(also for the people that like to go triple jungle with AP 
+ Attack Speed 
+ Crit 
{{summoner:2}} 
, I feel your pain, but you'll just have to deal with it and have 1 or 2 of you walk into a place where the enemy has vision so your team has the buff)
TL;DR Remove the global sound and visuals UNLESS your team had vision on the dragon at the time of the death Don't apply the buff until 3/4 members of the team that killed the dragon are visible OR **your team had vision on the dragon at the time of the death **