As a Troop Leader, parents are your best friend and worst enemy. It's hard for parents of young children to let go sometimes. They want to see and do everything with their child, because they always have up until the point of starting school. With our society where both parents work, they know they miss so much and it's hard to accept their child is growing and learning without them, especially when it's fun activities and there isn't a one-way mirror to watch them learn to dance in dance class.
Was it easy to implement and explain to our troops? No. Do I feel they are thankful 5 years down the road? Those that remember pre-policy are thankful. They have a way to limit parents and say "It's Service Unit policy". Those new troops coming in have never known any differently, so to them it's just the way it is.
What it has given our leaders, though, is the ability to work with their parents to rotate chaperones for events. We have all Service Unit events for the upcoming year planned in July. They can go down the list and select the ones their troop will attend. Then, they give the list to parents and have them select 1st, 2nd, 3rd choices and set up their chaperones. If you have 10 girls, you get 3 adults. Attend 4 events and everyone gets a chance to chaperone. This is just Service Unit events, too. There are also Council events and troop activities and meetings. You can easily do the same for those events. It takes planning, but you need to plan your year and give a list to your parents. That's just being a great leader and your parents will appreciate knowing what is coming up and how many dates to add to their calendar.
I also have a Troop Leader/Parent agreement I do with all my parents at the beginning of the year to outline expectations.
I leave with this... keep in mind, this is GIRL Scouting... not FAMILY Scouting. But, you need the family support. If you have little girls in your troop, don't worry. They'll grow and parents will become much more selective when they want to be around. By the time they reach 4th or 5th grade, you most likely won't have this problem anymore. Ha!