He told me that it was a cool experience once. But now, rather than having a relaxed first class meal on an overnight flight [EDITED: He may have taken daytime flights], he was getting into London in the middle of rush hour. He could probably have flown the Concorde had he wanted to but didn't have any real interest in taking it again.
And, today, with modern lie-flat business class and entertainment systems, there's even less reason to fly supersonic IMO, unless you're a CEO, lawyer, investment banker etc. flying from NY to London to have lunch with someone, seal some deal, and be back home for dinner.