Did you notice the reduction of information density on web pages? I think that would be the biggest immediate difference. Old Reddit vs. new Reddit as one prominent example. The dominance of responsive designs now, as compared to the old separation between main site and mobile site, as another example. I guess hamburger menus weren't a big thing in 2013? I honestly can't remember. Maybe time to hit the Internet Archive and look at pages from 2013.

It's interesting thinking of the changes. I guess many of the current trends were well underway by 2013 so the current state would be different but not too different to you. At any rate, I'm glad you're out and hope you can sort the ID mess.