Well, guys, I didn't want to spoil the fun by participating with DKC2 but I didn't want to give away any tips so I waited until now to post this:
That's World 1 and World 2, 100%. Demonstrates warps in every stage, even where they slow me down.
I can do it a lot faster now. That was just something I threw together when Penny-Arcade forums was doing a Let's Play around 2007. I was too late to get a world assigned to me, so a I just made that to show off. It had been years since I had played. I did a practice run and determined that I can do it a lot faster now but I've probably had even more time off.