I went through the same thing when Dad died. He was a carpenter and woodworker with an extensive (30' x 30') shop at home. I made many trips back home to clean it up and help Mom get ready for a woodworkers' dream sale. In the process I brought home tools and hardware to add to my own small shop. I also brought home quite a bit of hardwood lumber for making picture frames. A decade later, most of that lumber is still sitting here! I've made a few dozen frames in that time period, but really haven't made much of a dent in the stack of lumber. Too little time!
My grandparents weren't so bad, except for the chairs. For years they had bought cane bottom chairs at estate sales to re-cane, refinish and resell. However, when Granddad died and Grandma moved to the nursing home there were still 75 of these unfinished old chairs at their house!
I'm trying to keep our accumulation under control, but I'm not sure I'm winning that battle.
As far as maps are concerned, I've had a love affair with them and geography since childhood. I think there's probably some relationship between my love of old hand-crafted maps and my love of the engravings on stamps from the late 19th and early 20th centuries. My favorite college class was cartography. The prof asked if he could keep my final project to show as an example to future classes. I let him keep it, but wish now that I still had it.