Hasek was really good in the 1999 playoffs but he received strong support from his team that year. I'm thinking that even just a good performance from a goalie could have gotten Buffalo to the finals. Buffalo was a good defensive team in 1999, allowing the second fewest goals in the league and the fewest in the East. It was a middling offensive team, but through the first three rounds of the playoffs Buffalo was the best offensive team in the playoffs. Buffalo averaged 3.3 goals per game through the first three rounds, better than any other team in the playoffs, and was also very consistent - never scored fewer than 2 goals in a game. The team also scored early usually, averaging a first goal at around 13 minutes into the game and scoring first 11/15 games through three rounds.
This support largely dried up in the finals against a very strong Dallas team and predictably Buffalo lost, but 1999 wasn't a case of Hasek dragging his teammates kicking and screaming to the finals. Through three rounds Buffalo played really well as a team and quite possibly gave Hasek better support than any other team gave its goaltender. I still wouldn't be against Hasek getting the Conn Smythe over Nieuwendyk, but that's mainly because I don't like Nieuwendyk's case for the Conn Smythe a whole lot.