When I was a kid, the first time I walked into a video store, it blew my mind. I spent every weekend for years binge-watching 3, 4, 5 rented movies. Now, I haven't actually watched a movie in years. I think that although there are new movies coming out, the patterns are fundamentally the same and so movies have gotten boring. After you've seen Apocalypse Now, Evil Dead, and Blade Runner, the Wire, Caddyshack, Oldboy, No Country, Night of the Living Dead, Y Tu Mama Tambien, and on-and-on-and-on, you've seen damn near most of the plot variations that can conceivably be constructed. So, new stuff just looks the same as the old stuff and it's not so exciting.
Same with the internet. I discovered 90% of what I still think is cool by the time I was 13. I picked the low-hanging fruit. So, now I'm at the point where I go deep on things. It's not sexy, but it is pretty rewarding. Used to think Magic-1 was awesome, well now Ben Eater's 8-bit-kit is half-assembled on a table in my living room. Used to think rock climbing was cool, but now I have to put in weekend after weekend at JTree moving over granite. Used to think Fravia was cool, well now it's time to construct my own web-crawlers. Used to think metalcasting and the Lindsay Catalog was fascinating, but now it's time to build actual internal combustion engines from scratch. Used to listen to the old Defcon DVDs on a pre-iPod mp3 player, but the time came to actually work through Erickson's AOE.
I think it's a natural evolution of life. When you're young you make a shallow pass and find what really resonates with you. When you get older, you spend more time digging down deep into those things and it's not as exciting as it once was, but there is a satisfaction from getting good at those things.
An alternate approach is to try viewing the internet through the lens of cannabis. I've had many nights in life where smoking some pot and watching YouTube has segued into a late-night coding session implementing something fun in Python that's been kicking around in the back of my head for a while. Pot has a way of helping you see things you've seen a million times in a completely new light. Some people love it, some people hate it. YMMV.
Most people seem to hit this point in life and just have kids to keep stuff interesting when things start to get boring. They take up a lot of time, teach you a lot of stuff, and suck up a ton of time.