The McFly star expressed surprise at his success in the ITV show, as he expected to be the first person voted out.
"I didn't do anything," he argued to hosts Ant & Dec. "I felt like I just chilled in my hammock the whole time."
Poynter suggested that he may have initially kept a low profile due to the "terrifying" prospect of living with people he did not know.
"I was just so paranoid that I was going to lose my mind and not have anybody to talk to," he said, before gesturing to his fellow finalist Mark Wright and saying: "Thankfully [he] was there feeling exactly the same."
Poynter identified his challenge to sabotage the camp with Antony Cotton as one of the highlights of his I'm a Celebrity experience, though he confessed to being taken aback by the angry reactions of Willie Carson and Crissy Rock.
"Watching the carnage was brilliant and the morning after it was horrible, everyone was so annoyed at us," he recalled. "I though everyone was going to be [fine] with it, but they weren't. They were like, 'That's stealing, you should be hung'."
Poynter added that he had always been "super-nervous" about the bushtucker trials, but found most of them to be "awesome" fun.
"I've had the most amazing time," he concluded. "I'd do it all over again if I could."
> 'I'm a Celeb' runner-up Mark Wright: 'It was an honour to be myself'