Summoner spells all have long cooldowns as they are just extra spells that can turn the tide of a fight, I use Teleport, incase I need to go heal and I can get back to defend a turret anytime, and Clarity incase I run out of mana in a fight or just plain want to stay in the game without having to go recharge then travel back.
The thing with your timing, you get used to it, I forgot to ask, do you have your camera locked on or free? Because its best to have it unlocked and just move the screen my pushing your mouse into the edge, it helps you better plan things and watch other places