I am blown away by these Mac apps

All I have used are just two apps: CleanMyMac 2 and Day One. And they are simply amazing. Worth every penny. I am blown away by the design and feature implementation Mac apps. WOW. Day One is especially awesome.

And as I think of the reasons why, as I keep using Mac apps, I get the feeling that the care that Apple puts into its products extends to the developers. Just as nobody cares as much about the true user experience as much as Apple, Mac apps give me the feeling that they have really put a lot of thought into making a great user experience, instead of riddling it with feature after feature to make you buy it. (hum hum, Windows apps)

Yes, they are expensive for the comparative feature set. But they make me happy. What are some Mac apps that make you happy and you wanna recommend?