I am a wall-washer too. Helps with the kid's hand prints that seem to be at their chest level throughout the hallway and any open wall!
What is killing me are the corners. House is from the 70s and the corners have a metal angle piece that is plastered and painted over. Any impact, the plaster goes flying and you are looking at galvanized metal. What can be done for that? I have been putting new plaster paint, but it is a yearly activity that's no fun. Currently I don't have matching paint left and dragging it out, as I know it will mean painting all the adjacent walls if I get buys on the corners ...
Frequency of paint is 5+ years here. Currently I am on 8 year old paint. Had tenants in the house for 5 years and didn't even have to paint when moving back, they were that clean. We have done much more damage in 1.5 years than the tenants did in 5.
G