Paddy Madden and Matt Dolan scored either side of half-time, with Alan Judge equalising for the hosts from the penalty spot in the 49th minute.
Yeovil have recently squandered leads against Crawley and Carlisle and were held to a goalless home draw by Walsall on Friday.
But Johnson feels the win at Meadow Lane, which saw the Somerset club climb back into the play-off positions, could get the Glovers back on track.
"Some of the players that haven't played well in the last couple of games came up trumps," said Johnson.
"I thought in the first 10 minutes we had three or four good chances and we looked like we were up for it.
"We scored the goal and came out after a real rallying speech at half-time only to soon be drawing, and then you start to think 'here we go again.'
"But we got the lead back and we had to keep it because on that pitch both teams had to go longer than they wanted to.
"We had to defend our penalty area in the last 30 minutes because they hit it longer, and I thought we did that magnificently and still got chances at the other end.
"We found a few things in this game that we have been lacking recently and hopefully now we can keep doing them for the remaining games."