Your Chromecast takes 30 seconds to load content? In our house someone pretty much always has either their phone, tablet, or laptop nearby and with the HDMI-CEC, you don't even have to find the TV remote to switch inputs, you just queue up want you to want to watch and it plays. And then people can take turns with their respective devices (if you're watching YouTube videos or playing music, etc.)

We also have a Roku and used that before the Chromecast, but the Chromecast is more popular with everyone (kids) in the house for the aforementioned reason of communal use. It's like the Nexus Q was supposed to be, but for video.