Hi, I have a daughter at 5 ways (Y7) and she uses the green bus service, I can't recommend it highly enough.
While there are some after school activities most of the 'action' regarding clubs etc occurs at lunchtime. My daughter is in a choir, a G&T art club, basket ball club, badminton club and a drama club I know that some of my daughters friends who have been picked for hockey teams stay for one after school session a week - but for the rest of the time they get the bus.
I wouldn't dismiss the bus out of hand, there's a great social atmosphere on there.
Also, after the long and busy school day and the hour or so homework a night you might find that you'll want to cut down after school activities, in Y7 at least.
All the best for september