I think most people wonder about the effect on yourself, or convenience for you, and the effect on your child/children. Most of the time there is nothing that will swing the pendulum too far off the centre, but sometimes that changes.
The effect on me or DH is that going to breakfast club in particular keeps a 15 minute commute at 15 minutes (or under), which can fit with a manageable work start. Leave any later than 8.20 and the traffic and buses are much more delayed and stressful, which means maybe being slightly late for school and definitely being very late for work. On the plus side, breakfast at the club is v appealing to DD.
Effect on the child though - there were points when DD went to the only after school club that served the school (again, not served by any childminders). While there were others of her age group there, this was ok, although she didn't love it. After a couple of years she was the oldest with a group of much littler ones. I couldn't easily make other arrangements or I would already have done so earlier in her school life, but she really didn't enjoy that. The after school activities in sport and music etc would have been preferable and more in line with her actual friends, but finished around 4.15, 4.30, so just weren't covering the needs for working hours, and would change evenings each year, and sometimes during a year. A kind of day to day solution would be felt out, often with a 'I only need 30 minutes on this day, but there's no getting that,' but never anything consistent or ideal. For anyone wondering about school runs - as short a trip there and back as possible is a good thing to look at, if you can.