Looking at the lowest scored answers lets me find posts that may need to be flagged, try to help authors getting downvoted improve their answers, or quickly see what the least popular option in a meta discussion, which might challenge my perspective. (I seek out opinions that are different from mine, because I like confirming that my certainty I'm right is warranted, and like to know how certain I should be before I open my mouth ;))

 I would use both "lowest" and "highest" score sort orders, and would be mildly uncomfortable by the lack of symmetry if "lowest" wasn't there. 

I really like the switch to a dropdown, and the explicit highest/lowest, newest/oldest type options instead of the ascending/descending toggle.