~copy and paste is your friend~
you can also simplify backgrounds into a shorthand. i had a scene set in a wood, and after a few key panels of detailed scenery, it turned into brown streaks and a greengold gradient.
also, as people have said, if a background is unimportant to the setting, you can totally not include it until it is - a lot of comic artists, especially in manga and manga-influenced work, only include the background selectively, and if you choose to follow that route and break from reality a bit, suddenly backgrounds can become visual playgrounds to express mood. think of all them funky screentones you get in manga instead of background after background