I wouldn't like it either op.
Personally, I really dislike nurseries for things like this...the separating kids into different rooms, the 'key workers', the double entry doors, high vis vests, passwords...yes they're all for safety, but I just don't like how institutionalised it is.
I chose a cm because I wanted a home from home environment. My cm has a 1 year old (her dc), 3 year old, 4 year old (ds2) and 3 x 6 year olds (one is ds1, one her dc)...not always all at the same time, but occasionally they are all there.
They all eat meals around the same table, they all roll around together on the living room floor, the 6 year olds 'help' to care for the 1 year old. The cm does what any family does with dc - takes them places appropriate/safe enough for the dc she happens to have with her that day.
So on a day where she only has my two (her dc sometimes go to their grandparents for a weekend) she'll do more adventurous things - take them into town to see a kids attraction at a museum, or take them to the beach for the day, or go swimming. Things she wouldn't consider (or be able to in the case of swimming) if she had all 6. When she has all 6 they'll go to the local, very open park, where they can run but no danger of getting lost in crowds.
She has the 1 year old in a buggy, 3 year old on a wrist strap and the other four pair up and hold hands just next to her if she's out with them all. High vis vests would put me off tbh as it seems too much...like business. I'm not stupid, I know it is her business, her livelihood. But the atmosphere is completely family-like. It's hard to put into words exactly why, but it really would put me off.
When the dc had been going to her for about ten months, a friend of mine asked ds2 if he liked his childminder. Both the dc turned and gave her a blank stare, and ds1 asked 'Who? We don't have a childminder' and gave her a
look. Ds2 then asked what a childminder was. To them, they just go to Julie's house to play, which is the way I like them to see it.