Every Japanese person I've ever come into contact with is pretty crazy about taking pictures and keeping pictures. My husband has to have all pictures put in specific order in perfectly categorized photo albums. Heaven help anyone(me) who takes a picture out of one of his albums.
When my in-laws were here, my sister-in-law took over 800 pictures, all of which are on my computer right now. It's insane. She was even taking pictures of cows, tombstones, mailboxes, Wendy's kid's meal toy, and even my uncle's kitchen sink. It was pretty extreme, I think. It was amusing, but a tad extreme.
Any of the rest of them I've come into contact with are pretty much the same way, so the stereotype is true for all the Japanese people I know personally(which is much more than just my husband and in-laws, by the way).