Regional broadcasters likely have relationships with the players, and that comes out in the broadcast. Bowen will talk about recent stories with players, and actively cheers for the bottom six guys to score. He's genuinely having a good time in the booth if the team is playing well.
Gord Miller on the other hand, is more pessimistic or intentionally trying to remain neutral during the broadcast - to the point that Mike Johnson has to pipe in repeatedly to remind him of actual facts regarding the team. Gord Miller would rather talk about goal droughts, team records when trailing after a period, or salary-cap woes than actually try and emote.