I will share my results, despite, well, I want to be honest : I did not expect that.
I made a sheed, put every texture used in the map into it with an advice what it is used for. After this I categorized the textures by giving it a number ranging from 1 to 5 :
1 = This will not be changed.
2 = Are we back in the 80´s ?
3 = Well, some of this maybe.
4 = I can live without this
5 = Who put this stuff in there?
Facts:
497 lines total (counting doubled)
238 different textures used
43 category 1
23 category 2
55 category 3
32 category 4
89 category 5
To my defense : Much of the category 5 comes from the poolhouse. This is were i started weeks ago, toying around and checking things out.
Now i will try to take advantage of mattn´s new 'texture overview' feature in UFORadiant to get rid of this problem.