Heh, careful with that "we" - don't leave out those of us who are in the target demographic of both Hacker News and Pinterest. :)
I have less purchasing intent while browsing Pinterest than I do while looking at Yelp or Amazon (or Etsy), but I spend more time on Pinterest than on shopping sites. I've bought several things I had originally pinned just because they were interesting and then later realized would make a good gift for somebody.
Did you end up going back to Pinterest to find them or did you just have it in your head after pinning it? The entire attribution of a pin to a purchase in a store is tough if there's no obvious path from Pinterest to the retailer.
I usually go back to Pinterest to find the specific thing, and sometimes I'm directly browsing through my pins while trying to think of a gift. But it's a leaky system of course; for example, sometimes I've pinned a Flickr photo of the thing instead of an image linked to a website that sells the thing.
I have less purchasing intent while browsing Pinterest than I do while looking at Yelp or Amazon (or Etsy), but I spend more time on Pinterest than on shopping sites. I've bought several things I had originally pinned just because they were interesting and then later realized would make a good gift for somebody.