I used to love dark mode, but in the summer months, I came to feel that it's overly depressive, possibly affecting my mood.
In the winter months, it's slightly more usable because of association with lower lighting, darkness and even coziness. However, I think it can affect mood irrespective of the time of year.
Nowadays, I'm often experimenting with the idea of displays which are backlit with colours other than pure white or pure black.