Not all of his brothers and sisters in Heaven are douches Dean. At the same time, it is not untrue that Castiel would want to keep a connection to home. He does think it's a consequence to accept with choosing to call this place home.

Cas just nods. It's what he meant. He's hard to know all the time when Dean is stalling and when he is helping so the angel remains appreciative rather than skeptical with where he's going with this. It lasts as long as the time it takes for Dean to open his mouth with implausible ideas. "If there were anything like that to exist, it would be God himself or locked away in Heaven. I've never heard of anything that could do that." Something like that couldn't exist because it could essentially make anyone an angel. Thanks for trying though, Dean.

(Maybe there is something and Cas doesn't know about it yet.)