This absolutely mirrors my experience. Casual conversations with people outside of my team and friends, which would've happened by just being in close proximity to them have disappeared.
While I believe we're still working very well as a team, opportunities to form connections outside of our domain have dwindled. We used to have this Slack app called Donut [1] which periodically matches colleagues together for a 1:1, but these days people are sick of Zoom meetings so you really do need a sound excuse to set one up. In-person 1:1s were a chance to escape the office for some coffee and a snack; Zoom meetings are much less tantalising.