My view and only that since I am an odd duck.
I'd say that the governments have moderately screwed up the conversion. It's been decades now and we should all be done but they backed out of forcing supermarkets to go purely metric.
That means that things are measured metrically but labeled in both for things like meat. They tend to be advertised in lbs on signs since that makes the price look cheaper. This has kept people muddled up only partly converted.
For old guys like my friends (I will not say "and me") the conversion for speeds is mostly complete. That's because speedometers and speed signs converted totally. It's not exactly complete for us (actually for anyone) since the fools to our south are unable to handle the change so acceleration times in car mags and such are in seconds to 60 mph (with an admixture of seconds to 62 mph).
Most of what I read has metric with imperial in brackets which makes me crazy because I remember a number for a lot of things like distance, height, weight but then can't remember which system it was in.
Most people I know measure their size/weight in imperial but I only use metric.
Temperature was converted in the 70's and I'd say everyone is on Celsius for that. At this point I find F temperatures difficult even though I grew up with them. I know immediately how warn or cool or hot or col C is but have to make a rough conversion of a F temp to get a feel for it. That is other than around 100 F. That one I just know is hot.
Doing renovations back in the 80's I got slightly messed up by the conversion. Out 2x4's (and others) went metric in those dimensions. But they are cut extremely close to the metric size for 2 and 4 inches (which, of course they are not, more like 1.5 x 3.5 dry). But they are not exactly so when in the middle of a reno you mix old and new they don't line up precisely. That problem went away quickly enough.
Plywood thickness is the same ( I am almost 100 % ) sure, close to the old but in mm. However the other dimensions stayed in imperial so they fit in with old stuff (at least I think that is the case). I don't know if the building codes now call for metric in things like stud spacing.
To summarize:
speed, temp is pretty much totally converted.
liquid measure mostly but people use a mix in the kitchen depending on how old they are. I convert all recipes to metric if they aren't already.
most people still give their weight in lbs (I don't)
Things like building heights etc re mixed in many people's minds.
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