@ryanroy , I have been in situation like where you have to convince the team about the importance of your role.
Personally, start to open conversations by listening the simple frequent user issues intetracting with particular windows. Later, i ask talkative member to think how to overcome those issues.
In case with mangers it is good to compare with other organisations success specially in saving money .
Most of the presentations I use GARTNER reports to emphasis the failure precentage in IT filed . Why IT projects fails`