Regarding the "now what was I going to do in here?" problem, I read an interesting article:

doorways make us forget what we came for

The solution, obviously, is to remove all your doorways. Do people who live in open plan houses forget what they came for?

I have a trick. If I think of something I need to get or do in another room, I think of an object I will see in the room e.g. a picture on the wall, and tell myself that when I look at the object I'll remember to do or get whatever it is. It works for me.