So I'm definitely not the only one! I could never hurt the ones in Epic Yarn that sat together like that too, since the Waddle Dees in EY literally could NOT hurt you unless they had a spear.
There's a stage in the beach world in Epic Yarn where you can stuck in the center of a group of 5 or 6 Waddle Dee's. It's like a Kirby & Waddle Dee mosh-pit. They bump Kirby back and forth, fall down, get up again, repeat... xD