Including respect and admiration.
"You know what you're getting every single night," said Crosby, who has played on a line with Bergeron and Boston forward Brad Marchand for Canada. "He's got amazing hockey sense. He knows exactly where to go, where to be on the ice to support the puck, whether it's to do a little thing to create room or to create an opportunity for himself.
"Whatever the play dictates, he's able to adjust and make sure he's doing the right thing out there. He's a pretty responsible player defensively too. He doesn't cheat. There's no way he's going to cheat to get offense. He's going to play the right way every single night and compete hard."
And still manage to score goals; the 33-year-old has had at least 30 five times in his 15 NHL seasons since Boston selected him in the second round (No. 45) of the 2003 NHL Draft. Bergeron finished this season with an NHL career-high 79 points (32 goals, 47 assists) in 65 games, surpassing the 73 (31 goals, 42 assists) he had in 2005-06.
Learning about his game informed the way Crosby has approached games against the Bruins, whether in the regular season or the playoffs, where the teams last faced off in a 4-0 Bruins sweep in the Eastern Conference Final in 2013.
"I think you prepare to just compete for every inch of ice out there," Crosby said. "I think that's the mentality when you're playing against him. You know that he's going to be in the right position, so you as a guy playing against him, you can't look to cheat because you know he's going to be in the right spot and is going to make you pay the other way."
He's done it before. He's done it to Crosby and Tavares and O'Reilly and Stamkos, to the Penguins and Maple Leafs and Blues and Lightning.
But these players haven't just seen it across the ice. They've seen it on their lines, next to them, for their country. And they know what Bergeron has meant to the Canada national team, what he has meant to the Bruins, what he would mean for any team that had been smart, and lucky, enough to draft him.
"If you're going to start a team and you want a role model," Stamkos said, "that's the type of guy you go after."