Detailed backgrounds are tedious to draw, but I don't mind, and I draw them because they're important to establishing the world around the characters, and I like adding in little details each time.
Almost the entirety of my comic is made with vector graphics, which makes it very easy to reuse backgrounds, or background props, and make it easy to scale them up or down as needed. I change up the scenery a lot though, so many of the detailed backgrounds I've spent a lot of time drawing, I've drawn and used only once. I've found drawing architecture to be easier with vectors than by hand, but for nature scenes to be a lot more difficult with vectors.