I took my exam in October of 2018, and received the certification email just after Christmas. My experience was very similar to yours. I'm also a CISSP, and found that covered the security basics, so a candidate thus certified would only need to focus on "cloud-specific" subjects.
I completely agree with your assessment regarding the ease of the questions (bearing in mind that I have 8 years of cloud architecture, engineering, and security experience), enabling completion of the test in 2 hours, as well.
Although the CISSP is not a prerequisite, it helps a lot, as does the years of hands-on experience. There were approximately 60 students in the compressed 16 hour CCSP boot camp that I attended during the 2018 Security Congress in New Orleans. When the instructor, @Ben_Malisow, polled the class as to how many held a CISSP, many, many hands went up. (Ben, you had a better view of the class than I did; was it approximately 80% or 90%, would you say?)
Congratulations, and welcome to the club of (ISC)2 professionals that hold multiple certs from them. On their "Member Counts" page it would be an interesting statistic to see how many of us hold multiple certs, and which ones they are.
Congrats and thanks for the comparison, I've just passed the CCSP and was considering doing the CISSP as much of the risk management and physical security seemed to be shared between the two.
While the content is fresh in my head I thought I'd work on the other additional domains the CISSP covers, you've highlighted to be prepared for a stiffer challenge.
Thankfully there's more structured learning content available which was challenging for the CCSP, I ended up relying on general knowledge as most of my learning's seemed unused on the test.
I have to say the CCSP surprised me a bit, in a good way. The material I used, the CCSP study guide and practice tests helped, but it was more practical (What would you do in this situation?) than the regurgitating of facts. Being a newer cert, I didn't think there would be that much maturity in the testing. Definitely a good coverage of cloud concerns, and well worth the study time I devoted. Now if only ISC2 wasn't so slow in finishing the paperwork...but that's another thread.