Urgh... I hope places don't keep the prebooking thing. Or if they do, it's just for those annoyingly organised parents who plan their time with spreadsheets people who want to be guaranteed that they won't have to queue if they turn up at a particular time. Prebooking makes me stressed. Even booked concerts/ train and plane travel and stuff that you've always had to book and turn up for at a particular time, I just worry we'll miss it so have to plan the day with military precision and build in "late" time. It's odd... I used to be able to cope with it, but have got so anxious about it for the past few years. I think it's the menopause 
I like having the flexibility to (shock horror) change my mind, or get distracted at something else and be a bit later or earlier than planned. Or even allow for buses/ trains being a bit late, so not having to get the one before the one we need to make our booked slot, and then hang around outside for aaaages getting bored and cold.