As with everything, it depends on how you define it.
I budget for most things, so whilst some people might pay for a meal out using their personal spends allocation, I've already accounted for that expense out of a different pot. So, whilst my budget for personal spends might quite seem low given the sort of job I have and the income you might assume I have, it's because very little actually falls into that category. I budget for things like dental appointments and clothes separately, they don't come out of personal spends.
Personal spends to me are things for me that are whimsical, fun and unanticipated. I allocate £49 for this, but there's an expectation that I don't actively try to spend it. It's there if I need it, but if I don't touch it at all, it gets reallocated to savings.
Last week for example, I spent £6 on books as an impulse buy. The week before, I spent £26 on a random gift to cheer up a friend. (I only budget for presents for family members' birthdays and Christmas - things for friends are more ad hoc, so they come out of personal spends.) That means last week I reallocated £43 to savings and the week before, £23. I don't roll forward fun money, if it's not used, it goes to savings.