One that has been a total game changer for my company is when I'm hosting a conference call, I can simply "Invite by Phone" my participants. They get a phone call, are prompted to "Press 1 to enter the conference", and boom they're in. It's drastically reduced people fumbling around with phone numbers + participant codes, ending up in the wrong meeting, or getting stuck in some unnecessary software install loop. If someone is more than two minutes late, they're getting a phone call that brings them instantly into the meeting.
Also a really nice feature, again for phone conferences, is when people dial-in I see their phone number handle in the UI. But during the call as they introduce themselves or I look up their number, I can then rename their user to something recognizable. Now if I'm on a call with 5 people at another firm, I appear really impressive because I know who each person is by their name. When someone is speaking on the conference call, their icon lights up. If someone has a ton of background noise I can easily mute them.
Zoom Phone (addl paid feature) is awesome too. Virtual phone numbers, IVR, call routing, busy hours, I can instantly turn a 1:1 conversation into a zoom meeting that other people can join, etc. Zoom Phone works on my iphone like a regular dialer, and I can place/receive fully digital calls on it (pretty similar to how Google Voice works), so it doesn't matter if I have actual cell service.
I've never used Microsoft Teams, and does look really snazzy, but Zoom is an absolute joy to use compared to every single other conferencing software I have ever used. The video chat and screensharing is fast and responsive and just works exactly like you would expect it to.