I've worked at multiple places that implemented weekly "Donut Buddies" (https://www.donut.com/) and I think it's amazing. It never felt forced, let alone "infantilizing." The truly socially anxious people could just opt out by leaving the Slack channel for it so they wouldn't be assigned a buddy anymore. I found it amazing for building relationships around the company.

I'm at a tiny startup right now as an engineer, not mgr, and I have weekly 1:1s with every other member of our team. Especially now during remote work, it's a godsend for getting to know teammates.