Most expats are used to overseas traffic which is way worse than this and do longer journeys in it. I used to drive for 45 mins to work; my husband drove for 1.5 hours in each direction when we lived in the UK. I think if you are a HK person, the Sai Kung traffic is awful. If you are an expat it's pretty good compared to "back home".
That's Stage 2 which they're still planning. Stage 1 has indeed started work:
https://www.hyd.gov.hk/en/road_and_r...ams/index.html
But the actual downtown core of Sai Kung is already too crowded, unless they also increase the size of the pier, bus stops (very long queues on weekends), parking areas, I don't think relieving traffic congestion is going to help much.