I had my interview at Cranbury today and can vouch for everything you said, I had basically the same experience!
The space was beautiful -- I will mention that the interview rooms currently have glass walls (floor to ceiling) and are fully visible from the waiting room, so we were able to see IO's prepping and going over files while we waited. Kindof weird for the lack of privacy, but it also meant that we had a view of the lake while waiting and during the interview itself, which was serene!
I had a similar experience through security and check in as well. The lawyer I hired to attend with me was on laughing/joking/friendly terms with every clerk/manager/security guard who wasn't a new hire, as the majority of staff at this office were transferred from Newark and they'd all known eachother for decades. All the staff who've been transferred from Newark are apparently thrilled to be at Cranbury, so the vibe is very pleasant.
Waited about a half hour past my scheduled interview time before being called in. I was sworn in, took the reading/writing/civics test, and we went over my N400. IO confirmed my name/birthday/address, and my height "because that's what we'll be putting in your certificate" which made it obvious that the decision about my approval had been made before I even stepped into the room. Did not ask for originals of any supporting documents, tax returns, or anything else -- interview itself was under 10 mins for sure!
IO took my GC and reminded me that I'll need to apply for/receive a passport before I can travel outside of the country again. I was handed the "Congrats you passed the interview!" paper and told to wait back in the waiting room until the next oath ceremony. Ultimately a small ceremony was held after about an hour. I was in and out of the building in under 3 hours with Natz Certificate in hand!