Vintage glamour: I regularly use some of the furniture like the bed and the vanity table. The vanity table is mostly for decorations, not gameplay but l like to add them to fancy bedrooms. The globe bar is an essential when my sims throw a party. Instantly 6 drinks with no time lost mixing. Some of the clothing is also very nice, especially the long dress and fancy bathrobe. I have not yet tested the butler.
Back yard stuff: I mainly bought this as a completionist and shortly after my real life kids had used a similar water slide. Just like it's real life counterpart, the sims 4 version barely gets any use. There are a few items that get used in my builds but that's about it.
Country kitchen: I prefer the cottage living counters because they have less curtains. I do like the appliances and rest of the clutter.
First fits: I don't have many cas kits but this is one of the few I might consider.
As for your later additions
Romantic garden: I like some of the cas, especially one hair. I occasionally use the wishing well when I want to resurrect a sim in a non-spellcaster household.
Toddler stuff: I got this at release when we had very little toddler CAS. It has a lot of cute items. I also like the toddler slide and to a lesser extent the ball pit for public playgrounds. I tried toddler dates once but the inviting parent has to know the toddler which makes it impractical to set up
Nifty knitting: one of my absolute favourite kits. I have a lot of sims with knitting as a hobby. The outfit for newborns and infants are cute, the decorative craftables items are nice,... I like the cas as well. And plopsy, awful name but a great addition to sell all kinds of craftables. This stuff pack is a must have for me.