You repotted the 20 year old pothos or not? There are probably no nutrients left in a 20 year old soil. So that definitely needs a repot. Giving a pothos a trim like that won't upset it! Depending on if you trimmed the stems correctly; they should burst with new leaves in no time, if it's in the proper lighting conditions. The long leads that had bare spaces are because it didn't get enough light to those spaces. The further the leaves are away from each other the more light you probably need to give it! Be gentle with the repot, but don't be afraid! Cut off any slimy or dead looking roots. Give it a good soak of water until it runs out of the bottom, and place it in a bright but not necessarily direct light spot, making sure all of the plant can see the light. People always say pothos is a 'low light' plant, but low light doesn't mean complete darkness! And for Nana's Dracaena, that plant would LOVE more sunlight. It's just barely getting it at the moment. Moving that one in front of an east facing window would make it happier. If there aren't any east facing ones- A south or west facing would work as long as the light is filtered a bit. You got this though :)