Johnson arrived at the Blues with Bernard Morley after the pair had got promoted with Salford City.
They made no secret of their aims of another promotion but after missing out on the play-offs, Johnson understands it could be hard to find positives, but insists there are plenty.
"We learned a lot about ourselves last season and more importantly we learned a lot about the club itself," he told the club's video service.
"The supporters are desperate for some sort of sustained success, we all are.
"It was a season of putting roots down in terms of what we are going to do moving forward. In terms of that, it was a successful season. When you break it down and look at what we achieved with how close we got to the play-offs; we had an ok season.
"We felt last season we weren’t experienced enough so we put down a list of names and we’ve got all three of them – they’re really exciting signings.
"To get them players in with the calibre of clubs they had after them shows what a pull this club still is to players."