I started riding more with a group and they definitely want to always go very quickly on the flats (around 24+ mph). It's not for everyone - clearly. For medium rides, it's fine for me but for century rides, I prefer to enjoy the scenery and slowing down but riding in a group, you are always so focused on keeping up (and drafting as much as possible) and looking down-not looking up.

But, honestly, when I observe the other riders, I don't really see people enjoying riding in a group; I see people just barely keeping up.