If you are an achievement-oriented player, then I think the only element of long-term value for you would be the Lifestyles. Sims acquire them by their actions and if circumstances force them to act against their lifestyle, they will constantly have to fight bad moodlets.
Other than that you level your sims to level 6 climbing, do the mountain expedition once (or twice, if the ice cave isn't open at your first try) level skiing and snowboarding, run each slope until you've seen all the tricks, maybe buy simmis capsulas until you have completed the new collection and that was it, I think.
For me it makes a difference whether a group of vacationeers goes up the mountain, my cops on hot pursuit, a group a UFO conspiracists or the disciples of the motherplant who have revived her up there (pull from debug, place, profit). So this event alone will entertain me over and over. I'm also a screenshot nut and get a lot of mileage out of the new world and taking pics of my sims fail at sledding from different angles.
The new career is great to differentiate between the everyday office drones (salary person) and the well connected college graduatee management person (basegame business), for worldbuilding and roleplaying this imo is the best thing since sliced bread. Gameplaywise it's just another ten level career track, only somewhat harder/more tedious.
CAS is amazing, as always of late. I already loved the Uni and Eco CAS items a lot.
