Yes some like flat light. I did not say flat light is a desire killer, but it can get to be very boring after the same thing for months.
But -- your location is southern California.
Today, the light has been spectacular. This time of year the sunny days have a low sun, clearer air than spring and summer, and fantastic shadows. It's like golden hour all damned day in December!
I'm going outside as soon as this load of laundry is done. Rains are coming next week, so they were even nice enough to schedule the nice days on the weekend.
And a good cure is to try something else. Maybe artificial light. Take a picture of an apple with a speedlight. Pull out your macro lens. Get a friend to pose and play with portraiture. Maybe mess with the soft winter light coming in windows. Something different or that you haven't been doing for a while. Then when you get back outside maybe it feels a little more fresh.
I've been bored with my normal scenery and wanting to use up some film so I got a little wound up in lighting a couple weeks ago, and macro stuff. Just taking photos of things around the house. Guitars, cameras, whatever. I think "How do I deal with those weird reflections?" or "how can I do this with just one light?" and make it a challenge.