Living quite centrally, and having learned the bus system, I am quite happy walking, taking the bus (green minibuses FTW!) and MTR, as appropriate.
Uber has become near-useless: expensive and time-consuming to get a ride. Gonna take an Uber? Better book it at least ten minutes in advance.
Of course the ins and outs to taxis are known to every HKer…I will say though that four of the last five cabs I’ve taken accepted Octopus, which amazed me.
Best
E.