4e Pack Lord: Whenever heroes kill one of its allies it can force one of them to hit themselves, it can move multiple allies forwards, grant them extra attacks
5e Pack Lord: Just regular Gnoll but can recharge one ally's Rampage.
The main thing that kept me from switching to 4e was that it looked to be even more tedious to play combat than 3e. It had so many things to keep track of for me, even though I liked the idea itself.
Came back for 5e mainly because it was slimmed down and attempted to make combat more streamlined and faster to play. I did start doing customized low level creatures by adding an extra thing here or there so they have a bit more variety than the baseline. Especially by giving humanoids common equipment!