I went through this phase. My wife said "seriously hon, I need to not hear so much about this." I was hurt, shocked, and offended. Took it to my therapist for support... and they said "so, it sounds like she's asking you to respect her boundaries." To which my response was "... uh, boundaries?"
Boundaries! Boundaries are something that healthy couples have. I was able to define them, mathematically... but when it came to relationships, I've been atrocious at establishing them for myself or respecting them in a partner.
It's clear you want to be supportive. But you need to be yourself, you need time to absorb all of this, and it's way too much way too fast. You can't keep up with their changes. You need to establish boundaries. The good news is that if you know what you're doing, you can establish a boundary and expect it to be respected.
Think about it. How much time in a day can you handle watching their interests? How many times can they interrupt you before it annoys you? Turnabout is fair play, too -- how many times can you interrupt them with something "interesting" before they get annoyed? Take those amounts, and cut them in half. Put the boundary there. That way, if they overstep it a little once and a while, it will hardly bug you.
"Honey, I love you and I support you. I'm glad that you're finding all of this information, but I'd like you to dial back the amount that you share with me. I'm not upset by what you're showing me, but the amount of it is driving me nuts. What would you think of showing me only one or two videos a day?"
It won't be a painless conversation. But if you preface it with loving support, they might understand. If you mix in some discussion on the merits of boundaries, it might help your relationship more than just this conflict. If you can bring it up "out of the blue" and not in reaction to them showing you something, then you probably won't face as much emotional backlash.
