For bmw the traffic jam assistant takes over under 35 mph on a highway, like hands free. Have seen it work well, however all acc systems seem prone to lane darters.
Another caveat is that drivers assistance plus or pro is hard to find on loaners and demo’s if you’re looking for a good deal. Also it’s not the dealer bundling things its the way the manufacturer has everything set up, bmw offers a mini package on the x3 (lane keep) and then the full package (acc + others)
I think you need to provide insight on where you live or a rough geographic location, for example acc in the city is not as useful as acc in stop and go traffic on the highway or even general slowdowns. On a daily basis it’s going to depend on your commute, 30 minutes in a city is a pain in the a** but 30 minutes on the highway in moderate traffic is a breeze.