I'm in the same boat as the OP as I've had the Centurion card for many years. I didn't get much value from the card this past year and the concierge service doesn't really help. "The Points Guy" talks about his concierge with great reverence and how they plan out extravegent itineraries for him. I haven't had luck with fairly simple travel requests or setting up exclusive access to travel venues. I end up researching and booking myself, which takes time that I think the concierge should be performing. So besides having a Black Titanium Card in my wallet, it doesn't really do much else. I'm thinking I'll downgrade to a Platinum Card for the lounge access and to keep my average # of years of credit the same. The Card could be so much more, but isn't. The desire to have the card is stronger due to its exclusivity, more so than what it actually provides, unfortunately.

I'll look forward to the 5x points for travel on the Platinum Card. If the concierge service was stronger, I'd keep the card just for that, but it's just weak and doesn't replace an assistant/secretary.