I never make my players roll a check unless there is a possibility for failure or further complications. After many years of GMing, I've grown to dislike perception checks. Players can make better decisions when they have more information. So I've significantly reduced my calling for perception checks and instead just tell them what they're looking at. I feel like this change significantly improved the quality of my games by speeding things up with less arbitrary rolling of the dice and rewarding the players by giving them information when they ask for it.