I installed 5 lights inside and a porch light for both doors and haven't been a bit sorry. I use them all; but, not all at the same time. Inside, I normally have a light on in the area where I am working/reading/etc; and, when I leave that area, I turn it off. I use my porch lights all the time and it is sometimes the only way I find my way back to my trailer when in a dark campground. I have yellow covers on them so that there are no problems with bugs. That makes it even easier to discern which camper is mine. Sometimes, I forget to turn those off when I go to bed; but, that doesn't seem to cause the battery to go down much at all. A few years ago, I switched all but one light over to LED. (The one that I didn't switch over is Fluorescent.) If I hear a sound outside, it really helps to switch the porch light on from the inside and see what's going on outside. Plenty of lights is the one "luxury" that I allowed myself and I love it!
