Examples include: Scary Game Squad, Gamegrumps, Team Double Dragon, and the like.
I just find let's plays a lot more entertaining when multiple people are playing and chatting than when it's just one person rambling. But these are weirdly hard to search for!
How about co-op multiplayer? I've seen a few of those for Baldur's Gate 3. Like Neil Newbon or Jennifer English. Neil plays with his friend Tom (whose surname I have forgotten) and Jennifer with her girlfriend Aliona Baranova. Except for Tom all of them acted in the game.
I do like let's plays like that too sometimes - I'll give those channels a try. Thanks! Though I may have to wait til I finish with BG3 myself, which could be a while :p
I mentioned single player games specifically partly because I personally tend to like those games best, and I like to watch let's plays after playing the game through myself first, then seeing how different people interact with the game differently. I love watching people discover a game I enjoyed (which for me means mostly single player titles) in kind of the same way I might enjoy showing the game to a friend.
And anecdotally, I tend to feel like groups playing a single player game together tend to talk more about the game in a deep-read kind of way, or to talk about their lives, whereas groups playing multiplayer games seem more likely to talk about whatever is currently happening in the game in that instant, or it becomes mostly them joking and trolling each other. This is just my personal experience though, so it could be a function of the particular let's players and streamers I'm familiar with. I'm sure there are exceptions to this.
I like watching Let's Plays for the same reason as you, and while it isn't a group channel I heartily recommend Welonz. She is very thorough and approaches every game with great respect, usually giving a summary of her overall thoughts at the end.
I found her because of her VTM: Bloodlines LP, but her Witcher 3 and Cyberpunk ones are also fantastic.