I'm curious if there has been an increase of visitors to EOS.IO Stack Exchange. How can one see this?
You can see current general site stats on the Area 51 site while still in beta but you cannot view stats over time.
Once you have 5000 reputation, you get access to site analytics which includes the daily number of visits. There's only one user with enough reputation to do so, but the ♦ moderators have access as well.
To get an idea of how it looks like: here I posted some examples from other sites in the network. The image below is traffic for Meta Stack Exchange, not EOS.IO Stack Exchange.