Hi Raphael, using 'Use event ID' under Methods of Event Serialization would get you exactly what you're looking for.
Any time an event is set, use the visitor's user has as their event ID, which means that it would only be recorded the first time and that's it.
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Event serialization would help with events, but if you're trying to see just the first time that a specific page is seen, you would have to be firing/serializing a custom event for each page that you want this metric for.
Instead, you can build a segment for each page/event that you're interested in seeing the first interaction. It would look something like this. Make sure to select "after sequence" (highlighted in red circle). Also, this segment will only show the first time that the page was viewed per visitor in your report timeframe. So if you want to see the absolute first time that the page has been viewed by each user, you'll need a very wide timeframe.
Works like a charm. Thank you very much!