New Zealand have already claimed four bronze medals at the tournament.
Forsyth admitted he was thrilled to win his first world championships gold medal after three bronzes in various disciplines since 2008.
"It feels really good. I've had a few close misses and a few big disappointments. To be able to get through a full week like that and not drop a game, [is] unbelievable, I'm really proud of that effort.
"Right from the get-go we've put some really good sides under the pump through constant pressure."
Bellis said Forsyth's shot making was "just outstanding", he said.
"You need to have a team that gives him the opportunity to play those shots. Today was a great demonstration of that.
"Everyone complemented each other. That's what any team needs, no matter what sport it is."