I feel that your problem is becoming quite common among teams that have been operating in one particular way for long time. I really see myself represented in your question.
I have recently move roles and departments within the same company and have started to manage projects with a team that have been in the field for more than 5 years, hence they truly believe they know "everything". I have to agree that the knowledge they have in this field is excellent and this is helping me a lot to understand the problems and tips to liaise with other departments. They are lovely people and have supported my integration to the team in few weeks. However, after few months managing tasks I realised that there was a lack of communication which made me really uncomfortable. This could be one of the reasons for certain problems.
Every discussion is email based, even though we are sitting next to each other we tent to write a two pager email. No one has the time to read 200 emails of these characteristics and as a result we end up missing key information causing us losses.
In my previous roles I had quite a nice experience using SharePoint as the main mechanism to communicate issues, tracking project progress, managing meetings, log/store documents that can be accessed by anyone across the teams, setting RSS feeds and alerts, among many other benefits. So my intention ever since has been getting my team using this application, but they were not very eager.
It's difficult to change processes to people that have been there longer than you, but it isn't impossible. You will need to work hard to set up and build every site or library, and demonstrate the possible usage and benefits of them to the team. Try to develop friendly user guides (with plenty of screen shots), live demos, individual training sessions (focus on individual needs)... Ask you Senior Management to be involved, if this is a process improvement they will be more than 100% supportive.
It takes some time to move the foundations of their operational behaviour but if you work hard and constantly support them to understand the tool you would like to use they will move along :)