Bamba's injury-time goal salvaged a draw for the hosts as they dramatically denied the Owls a third successive win in the Championship.
Warnock's half-time teamtalk appeared to work as Cardiff improve greatly in the second period after trailing to Gary Hooper's 39th minute-strike.
"It's like winning a game," said Warnock. "I've been on the other end and you're just distraught, but it's great from our point of view.
"I thought we deserved it in the second half, we had 12 efforts to their two. We were disappointing in the first half, we carried on where we left off at Preston, we were in the back foot.
"Wednesday looked like they sat back after getting the goal but if they'd had a go at us we were vulnerable, so I was delighted to get to half-time at 1-0.
"They'll have the measure of most sides between the boxes, but they didn't test Neil Etheridge."