I play on Platinum, and I fully confirm that there are a lot of cheaters, they are constantly and in almost every game.
When I find games without cheaters, it's a pleasure to play, the teams play on equal terms and there is a struggle to win. As soon as the enemy comes a cheater, the game loses all meaning and goes only in one gate.
Today after two games in which there were obvious cheaters with WH (it's easy to see), I deleted the game, and will return only after Riot announces that they have improved the anti-cheat.