The obvious solution (to me) would be to use a web analytics package such as Google Analytics to track these details.
Unfortunately, free options that allow user tracking are few and far between. For example if you read section 7 of the Google Analytics terms of service, you'll see that this is not permitted.
Commercial products such as Omniture, Webtrends and CoreMetrics permit user tracking by name, so that is an option.
Aside: AppFusions has Confluence integrations for both Google Analytics and Webtrends, but none currently for the other solutions. :)
I experienced that most customware plugins are charged and other ones are still free but soon will be also charged.
Do you know any info about that? If it will be charged in a short time, than I rather seek for a diferent one.
I hope not, because this Customware Tracking Plugin seems the best one!
Based on your clarification of what you want (page views not user names), I would use Google Analytics. There's already plenty of info on integrating it with Confluence, including:
You could try the Confluence User Engagement plugin which AppFusions recently released on Atlassian Marketplace.
Additionally, user logins and search terms are tracked.
More details here:
Here's an example screenshot:
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