Having your very own (Cas would protest here, he has his "own heavenly duties to attend to" and blah blah blah,) pop-up angel is both convenient and terrifying.

On one hand, you get healed whenever you want, free entertainment from his lack of social skills and worldly knowledge, and a decent view.

On the other hand, he has absolutely no concept of privacy. Of course, there's his whole morality problem, but there's nothing scarier than walking up to this man — angel — looming over your bedside like the Grim Reaper himself with no explanation besides the gruff instructions on where you're supposed to go next.