Well, the difference between summer and winter lightwise is smaller further south.
Right on the equator there's no difference at all.
Exactly. I've only been near the equator on one vacation, in June, and not only were day and night pretty equal in length but sunset happened really abruptly.
As for summer vs. winter, I see a difference just within my state of Minnesota. At the summer solstice in Minneapolis it gets a little after 9 p.m.; in the northern parts of the state it's more like 10.