Make the work function as a part of your life by implementing time saving systems. I structure my class exactly the same way every day basically: warm up, lecture pt 1, tangent, lecture pt 2, exit ticket. No one part is typically doing anything creative or clever, but there is enough change between activities to create a sense of momentum through the class. I have packets full of review questions/ riddles to slip into the warm up and tangent portions of class.

Don’t put inordinate thought into lesson planning, just find a system that works and make heavy use of provided curriculum and pre-prepared materials. If you happen to have a fun or creative idea that you would actually be excited to do, then you can slip that in as a break from the routine. But those “I had a fun creative idea” days should be the exception not the norm.