The ex-Walsall shot-stopper made his fifth appearance in a Town shirt in the comfortable 5-0 FA Cup progression over Aldershot.
While Hurst admitted the 24-year-old. who faced just the single shot on target, had little to do on a ruthless afternoon for his League One leaders, he coped with everything else admirably.
Regular No.1 Dean Henderson was not permitted to play in the cup by parent club Manchester United, while Henderson now goes away on England under-21 duty.
MacGillivray drew applause from Town fans for the way he dealt with aerial balls into the Shrewsbury penalty area on a number of occasions.
"He's done exactly what he's done in the previous games when he's come in," said Hurst.
"It's a difficult situation for him because of how well Dean's done, but he can't do any more - and he certainly isn't doing himself any harm in my eyes and maybe other teams that are watching.
"He's been outstanding and long may that continue."
Town only found out that Henderson couldn't feature in the cup tie around 24 hours before kick-off.
Hurst added: "We found out yesterday. We didn't make a big thing of it with Craig or anything like that.
"Him and Dean are close anyway so I'm sure as soon as Dean knew then Craig was made aware."