There are a lot of movies about mummies coming back to life. But, for Egyptians would that not be worse than death to be trapped in the world of the living?

We don’t really know and can never know. The Egyptians didn’t really have a concept of a body coming back to life after the person had died. Corpse reanimation is much later concept. I guess, from an Egyptian mindset pov, they might not mind so much as the Egyptian afterlife was basically Egypt all over again, just with no work, so to be back in the land of the living might not be so terrible. Though this is merely speculation on my part.

They do, however, have ghost stories of a soul being trapped in the plane of the living, which you can read about in an ask I answered here.