I'm an ASL with a local group (Scouts), we encourage the PL's, APL's and TL's to organise and conduct their own activities which goes down pretty well, we step in and put it back on track when things start to go a little pear shaped.
The kids get on well, the leaders all have kids in the troop and have a ball.
Funniest incident I recall was about a year ago we took them out on a night walk along an old disused railway line, suddenly one of the leaders pulls them all up and sends them over an embankment to look for something, I wondered what the hell was going on just before he announced that he was busting for a pee and needed to get rid of them all.
We now have 24 Scouts, 4 leaders although one works night shifts a lot and we don't see much of him and SWMBO is on the verge of being pushed into the fray.
Arranging interesting activities is one of the strong points and keeps them interested.