It looks like I'm in the minority since I take very few pictures, especially if I'm just stripping the top of the playfield (as opposed to a playfield swap). I take parts off in small sections and put them in the resealable bags I get from my PBL orders. If it isn't obvious where the parts go (different length posts, etc.), I draw a little diagram or make notes to help me later and put it in the bag.
I also line up the parts in the order I remove them, which helps with games with overlapping ramps, etc.