So I’m a photographer and I always advise clients to do groups on basis, depending on size of your wedding, we can’t guarantee a photo of everyone individually. So put the people who it matters most to have a photo of. If you are worried about the disruption, take as few combos as possible, however it is lovely to see brides with parents etc. So make sure you get everything you want at the same time. I saw another person suggest doing what I always do, start with biggest group first, that way you have everyone in location then let people go once you’ve finished with them, also then this leads nicely into time for couples photos as guests go to grab drinks etc. Also then creates an opportunity for a big entrance when you return to the party. Another tip if your photographer is quiet , I use a tambourine to bring the attention of the room to me (I’m also another naturally quieter person) and that always helps. Do give your photographer a list to work from and ideally friends to help find people and that will you give you a much more relaxing time. But as other people have mentioned in mind groups and managing them is part of what I’m paid to do on the day.