Tried it for six months, mostly body weight exercises and dumbbells, three to five times a week. Aside from a moderate improvement in fitness (which I have no interest in), it changed nothing at all. No increased energy, no happy feelings, just a waste of time.
I find cardio to have a much more significant impact on my mood and energy. I can go into a run feeling like a miserable slug and come out of it feeling accomplished and more at ease. YMMV though