No sense of humor is actually VERY useful. The 'Having a Blast' moodlet is capped at 8 hours for every other trait combo I've tried, but for sims with No Sense of Humor, it caps at 15 Hours. Give this to a writer, to an astronaut, to any sim in a stressful career, and they'll still be amused by the time they get home. There may be no lifetime wishes, but it isn't as if sims can only have 1 trait.
Also, with nectar snobs get more of a boost than other sims. I tested this with a husband and wife. Husband drank nectar, thought it was nice, got a good moodlet, but his wife acted as if she were a professional wine taster from the first glass. As the husband drank more he eventually was at the level of tasting his wife had started at, but he never received the extra boost she always did from a good glass. The downside is that she was more sensitive to crappy nectar as well, and was more prone to getting a bad moodlet, or no moodlet if the nectar was crappy.
Snobs also get a couple extra buffs from mirrors, and also one from fireplaces.
Both of these are useful 'buff' traits that deserve more attention than you've given them, much like neurotic.
