A full house of 25,237 fans roared the hosts home on Friday night in the first of five Super Rugby Pacific games across three days at the indoor venue.
The defending champions had made what was intended to be a temporary Apollo Projects Stadium home a fortress since the city's deadly 2011 earthquake.
But they relished the flashy upgrade in the five-tries-to-two bonus point triumph that was not without some nervous moments.
Victory ensured the Crusaders avoided a clean sweep of losses to Australian sides for the first time in club history.
And it improved the defending champions to 5-5 and fourth, one point clear of the ACT Brumbies, who play the top-ranked Hurricanes on Saturday.
"It was amazing; genuinely lost for words coming in on the bus," captain David Havili said.
"For what the city's been through, to have something like this, is amazing.
"It was scratchy, but we showed a lot of heart and the pack stepped up and we got what we wanted."
The Waratahs (4-5) remain in seventh, two points behind the Queensland Reds (5-3), who have a game in hand and play the Blues in Saturday's other fixture.
An emotional haka - Waratahs pair Pete Samu and Ioane Moananu, both former Crusaders, even joined in - completed a hyped pre-match build-up, before the Waratahs took some air out of the occasion with back-to-back Sid Harvey penalties to lead 6-0.
Winger Dallas McLeod, into the side after an ill Sevu Reece's late scratching, scored his first to get the hosts rolling.
Stout defence twice forced the Tahs sideways when they threatened to reply before an all-in scuffle led to a yellow card for Waratahs forward Miles Amatosero.
The Waratahs held firm while a man down then struck back spectacularly with a full-field try that featured four kicks.
Twice Jake Gordon sent it high from the ruck to be regathered, before Jack Debreczeni went right, then left with cross-field chips that produced a Harvey try.
The Crusaders led at halftime though, Codie Taylor's converted rolling maul try making it 14-13 at the break.
Moananu was shown yellow minutes after entering the game and Leicester Fainga'anuku darted over to extend the lead.
The Crusaders then spun the ball right with a flat cross-field kick before second-rower Dom Gardiner ran and threw a terrific outside pass to set up McLeod's second.
Havili was the next man yellow-carded, for a shoulder to a falling Max Jorgensen's forehead that forced the Waratahs fullback off - he later passed his HIA.
The visitors kept coming, Teddy Wilson wriggling out of a tackle to score and make it an eight-point game with 15 minutes to play.
It only offered brief hope, Macca Sprenger straightening through a gap to shoot the hosts clear again.
"Discipline in set piece is what hurt us and ... key penalties that led to cards was our downfall," Waratahs coach Dan McKellar said, still hopeful his side can have a post-season presence.
"It's harsh learnings but, playing last year's champions, dominated the competition for best part of two decades.
"There are a lot of good signs."
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